AWS-Lambda: the AWS-Lambda plugin has been refactored by using lua-resty-aws as an underlying AWS library. The refactor simplifies the AWS-Lambda plugin code base and adding support for multiple IAM authenticating scenarios. #11350
OpenTelemetry and Zipkin: Support GCP X-Cloud-Trace-Context header The field header_type now accepts the value gcp to propagate the Google Cloud trace header #11254

Fixes

Core

Fixed critical level logs when starting external plugin servers. Those logs cannot be suppressed due to the limitation of OpenResty. We choose to remove the socket availability detection feature. #11372
Fix an issue where a crashing Go plugin server process would cause subsequent requests proxied through Kong to execute Go plugins with inconsistent configurations. The issue only affects scenarios where the same Go plugin is applied to different Route or Service entities. #11306
Fix an issue where cluster_cert or cluster_ca_cert is inserted into lua_ssl_trusted_certificate before being base64 decoded. #11385
Fix cache warmup mechanism not working in acls plugin groups config entity scenario. #11414
Fix an issue that queue stops processing when a hard error is encountered in the handler function. #11423
Fix an issue that query parameters are not forwarded in proxied request. Thanks @chirag-manwani for contributing this change. #11328
Fix an issue that response status code is not real upstream status when using kong.response function. #11437
Removed a hardcoded proxy-wasm isolation level setting that was preventing the nginx_http_proxy_wasm_isolation configuration value from taking effect. #11407

Plugins

OAuth2: For OAuth2 plugin, scope has been taken into account as a new criterion of the request validation. When refreshing token with refresh_token, the scopes associated with the refresh_token provided in the request must be same with or a subset of the scopes configured in the OAuth2 plugin instance hit by the request. #11342
When the worker is in shutdown mode and more data is immediately available without waiting for max_coalescing_delay, queues are now cleared in batches. Thanks @JensErat for contributing this change. #11376
A race condition in the plugin queue could potentially crash the worker when max_entries was set to max_batch_size. #11378
AWS-Lambda: fix an issue that the AWS-Lambda plugin cannot extract a json encoded proxy integration response. #11413

Dependencies

Bumped lua-resty-aws from 1.3.0 to 1.3.1 #11419
Bumped lua-resty-session from 4.0.4 to 4.0.5 #11416
Bumped OpenSSL from 3.1.1 to 3.1.2 #11361

3.4.0

Breaking Changes

⚠️ Alpine packages and Docker images based on Alpine are no longer supported #10926
⚠️ Cassandra as a datastore for Kong is no longer supported #10931
Ubuntu 18.04 artifacts are no longer supported as it's EOL
AmazonLinux 2022 artifacts are renamed to AmazonLinux 2023 according to AWS's decision

Deprecations

CentOS packages are now removed from the release and are no longer supported in future versions.

Additions

Core

Enable expressions and traditional_compatible router flavor in stream subsystem. #11071
Make upstream host_header and router preserve_host config work in stream tls proxy. #11244
Add beta support for WebAssembly/proxy-wasm #11218
'/schemas' endpoint returns additional information about cross-field validation as part of the schema. This should help tools that use the Admin API to perform better client-side validation. #11108

Kong Manager

First release of the Kong Manager Open Source Edition. #11131

Plugins

OpenTelemetry: Support AWS X-Ray propagation header The field header_typenow accepts the aws value to handle this specific propagation header. 11075
Opentelemetry: Support the endpoint parameter as referenceable. #11220
Ip-Restriction: Add TCP support to the plugin. Thanks @scrudge for contributing this change. #10245

Performance

In dbless mode, the declarative schema is now fully initialized at startup instead of on-demand in the request path. This is most evident in decreased response latency when updating configuration via the /config API endpoint. #10932
The Prometheus plugin has been optimized to reduce proxy latency impacts during scraping. #10949 #11040 #11065

Fixes

Core

Declarative config now performs proper uniqueness checks against its inputs: previously, it would silently drop entries with conflicting primary/endpoint keys, or accept conflicting unique fields silently. #11199
Fixed a bug that causes POST /config?flatten_errors=1 to throw an exception and return a 500 error under certain circumstances. #10896
Fix a bug when worker consuming dynamic log level setting event and using a wrong reference for notice logging #10897
Added a User= specification to the systemd unit definition so that Kong can be controlled by systemd again. #11066
Fix a bug that caused sampling rate to be applied to individual spans producing split traces. #11135
Fix a bug that caused spans to not be instrumented with http.status_code when the request was not proxied to an upstream. Thanks @backjo for contributing this change. #11152, #11406
Fix a bug that caused the router to fail in traditional_compatible mode when a route with multiple paths and no service was created. #11158
Fix an issue where the router of flavor expressions can not work correctly when route.protocols is set to grpc or grpcs. #11082
Fix an issue where the router of flavor expressions can not configure https redirection. #11166
Added new span attribute net.peer.name if balancer_data.hostname is available. Thanks @backjo for contributing this change. #10723
Make kong vault get CLI command work in dbless mode by injecting the necessary directives into the kong cli nginx.conf. #11127 #11291
Fix an issue where a crashing Go plugin server process would cause subsequent requests proxied through Kong to execute Go plugins with inconsistent configurations. The issue only affects scenarios where the same Go plugin is applied to different Route or Service entities. #11306
Fix an issue where cluster_cert or cluster_ca_cert is inserted into lua_ssl_trusted_certificate before being base64 decoded. #11385
Update the DNS client to follow configured timeouts in a more predictable manner. Also fix a corner case in its behavior that could cause it to resolve incorrectly during transient network and DNS server failures. #11386

Admin API

Fix an issue where /schemas/plugins/validate endpoint fails to validate valid plugin configuration when the key of custom_fields_by_lua contains dot character(s). #11091
Fix an issue with the /tags/:tag Admin API returning a JSON object ({}) instead of an array ([]) for empty data sets. #11213

Plugins

Response Transformer: fix an issue that plugin does not transform the response body while upstream returns a Content-Type with +json suffix at subtype. #10656
grpc-gateway: Fixed an issue that empty (all default value) messages can not be unframed correctly. #10836
ACME: Fixed sanity test can't work with "kong" storage in Hybrid mode #10852
rate-limiting: Fixed an issue that impact the accuracy with the redis policy. Thanks @giovanibrioni for contributing this change. #10559
Zipkin: Fixed an issue that traces not being generated correctly when instrumentations are enabled. #10983
Acme: Fixed string concatenation on cert renewal errors #11364
Validation for queue related parameters has been improved. max_batch_size, max_entries and max_bytes are now integers instead of numbers. initial_retry_delay and max_retry_delay must now be numbers greater than 0.001 (seconds). #10840

Changed

Core

Tracing: new attribute http.route added to http request spans. #10981
The default value of lmdb_map_size config has been bumped to 2048m from 128m to accommodate most commonly deployed config sizes in DB-less and Hybrid mode. #11047
The default value of cluster_max_payload config has been bumped to 16m from 4m to accommodate most commonly deployed config sizes in Hybrid mode. #11090
Remove kong branding from kong HTML error template. #11150
Drop luasocket in cli #11177

Status API

Remove the database information from the status API when operating in dbless mode or data plane. #10995

Dependencies

Bumped lua-resty-openssl from 0.8.20 to 0.8.23 #10837 #11099
Bumped kong-lapis from 1.8.3.1 to 1.14.0.2 #10841
Bumped lua-resty-events from 0.1.4 to 0.2.0 #10883 #11083 #11214
Bumped lua-resty-session from 4.0.3 to 4.0.4 #11011
Bumped OpenSSL from 1.1.1t to 3.1.1 #10180 #11140
Bumped pgmoon from 1.16.0 to 1.16.2 (Kong's fork) #11181 #11229
Bumped atc-router from 1.0.5 to 1.2.0 #10100 #11071
Bumped lua-resty-lmdb from 1.1.0 to 1.3.0 #11227
Bumped lua-ffi-zlib from 0.5 to 0.6 #11373

Known Issues

Some referenceable configuration fields, such as the http_endpoint field of the http-log plugin and the endpoint field of the opentelemetry plugin, do not accept reference values due to incorrect field validation.

3.3.0

Breaking Changes

Core

The traditional_compatible router mode has been made more compatible with the behavior of traditional mode by splitting routes with multiple paths into multiple atc routes with separate priorities. Since the introduction of the new router in Kong Gateway 3.0, traditional_compatible mode assigned only one priority to each route, even if different prefix path lengths and regular expressions were mixed in a route. This was not how multiple paths were handled in the traditional router and the behavior has now been changed so that a separate priority value is assigned to each path in a route. #10615

Plugins

http-log, statsd, opentelemetry, datadog: The queueing system has been reworked, causing some plugin parameters to not function as expected anymore. If you use queues on these plugin, new parameters must be configured. The module kong.tools.batch_queue has been renamed to kong.tools.queue in the process and the API was changed. If your custom plugin uses queues, it must be updated to use the new API. See this blog post for a tour of the new queues and how they are parametrized. #10172
http-log: If the log server responds with a 3xx HTTP status code, the plugin will consider it to be an error and retry according to the retry configuration. Previously, 3xx status codes would be interpreted as success, causing the log entries to be dropped. #10172
Serverless Functions: kong.cache now points to a cache instance that is dedicated to the Serverless Functions plugins: it does not provide access to the global kong cache. Access to certain fields in kong.configuration has also been restricted. #10417
Zipkin: The zipkin plugin now uses queues for internal buffering. The standard queue parameter set is available to control queuing behavior. #10753
Tracing: tracing_sampling_rate defaults to 0.01 (trace one of every 100 requests) instead of the previous 1 (trace all requests). Tracing all requests is inappropriate for most production systems #10774
Proxy Cache: Add option to remove the proxy cache headers from the response #10445

Additions

Core

Make runloop and init error response content types compliant with Accept header value #10366
Add a new field updated_at for core entities ca_certificates, certificates, consumers, targets, upstreams, plugins, workspaces, clustering_data_planes and snis. #10400
Allow configuring custom error templates #10374
The maximum number of request headers, response headers, uri args, and post args that are parsed by default can now be configured with a new configuration parameters: lua_max_req_headers, lua_max_resp_headers, lua_max_uri_args and lua_max_post_args #10443
Allow configuring Labels for data planes to provide metadata information. Labels are only compatible with hybrid mode deployments with Kong Konnect (SaaS) #10471
Add Postgres triggers on the core entites and entities in bundled plugins to delete the expired rows in an efficient and timely manner. #10389
Support for configurable Node IDs #10385
Request and response buffering options are now enabled for incoming HTTP 2.0 requests too. Thanks @PidgeyBE for contributing this change. #10595 #10204
Add KONG_UPSTREAM_DNS_TIME to kong.ctx so that we can record the time it takes for DNS resolution when Kong proxies to upstream. #10355
Tracing: rename spans to simplify filtering on tracing backends. #10577
Support timeout for dynamic log level #10288
Added new span attribute http.client_ip to capture the client IP when behind a proxy. Thanks @backjo for this contribution! #10723

Admin API

The /upstreams/<upstream>/health?balancer_health=1 endpoint always shows the balancer health, through a new attribute balancer_health, which always returns HEALTHY or UNHEALTHY (reporting the true state of the balancer), even if the overall upstream health status is HEALTHCHECKS_OFF. This is useful for debugging. #5885

Status API

The status_listen server has been enhanced with the addition of the /status/ready API for monitoring Kong's health. This endpoint provides a 200 response upon receiving a GET request, but only if a valid, non-empty configuration is loaded and Kong is prepared to process user requests. Load balancers frequently utilize this functionality to ascertain Kong's availability to distribute incoming requests. #10610 #10787

Plugins

ACME: acme plugin now supports configuring an account_key in keys and key_sets #9746
Proxy-Cache: add ignore_uri_case to configuring cache-key uri to be handled as lowercase #10453
HTTP-Log: add application/json; charset=utf-8 option for the Content-Type header in the http-log plugin, for log collectors that require that character set declaration. #10533
DataDog: supports value of host to be referenceable. #10484
Zipkin&Opentelemetry: convert traceid in http response headers to hex format #10534
ACME: acme plugin now supports configuring namespace for redis storage which is default to empty string for backward compatibility. #10562
AWS Lambda: add a new field disable_https to support scheme config on lambda service api endpoint #9799
OpenTelemetry: spans are now correctly correlated in downstream Datadog traces. 10531
OpenTelemetry: add header_type field in OpenTelemetry plugin. Previously, the header_type was hardcoded to preserve, now it can be set to one of the following values: preserve, ignore, b3, b3-single, w3c, jaeger, ot. #10620

PDK

PDK now supports getting plugins' ID with kong.plugin.get_id. #9903

Fixes

Core

Fixed an issue where upstream keepalive pool has CRC32 collision. #9856
Fix an issue where control plane does not downgrade config for aws_lambda and zipkin for older version of data planes. #10346
Fix an issue where control plane does not rename fields correctly for session for older version of data planes. #10352
Fix an issue where validation to regex routes may be skipped when the old-fashioned config is used for DB-less Kong. #10348
Fix and issue where tracing may cause unexpected behavior. #10364
Fix an issue where balancer passive healthcheck would use wrong status code when kong changes status code from upstream in header_filter phase. #10325 #10592
Fix an issue where schema validations failing in a nested record did not propagate the error correctly. #10449
Fixed an issue where dangling Unix sockets would prevent Kong from restarting in Docker containers if it was not cleanly stopped. #10468
Fix an issue where sorting function for traditional router sources/destinations lead to "invalid order function for sorting" error. #10514
Fix the UDP socket leak caused by frequent DNS queries. #10691
Fix a typo of mlcache option shm_set_tries. #10712
Fix an issue where slow start up of Go plugin server causes dead lock. #10561
Tracing: fix an issue that caused the sampled flag of incoming propagation headers to be handled incorrectly and only affect some spans. #10655
Tracing: fix an issue that was preventing http_client spans to be created for OpenResty HTTP client requests. #10680
Tracing: fix an approximation issue that resulted in reduced precision of the balancer span start and end times. #10681
Tracing: tracing_sampling_rate defaults to 0.01 (trace one of every 100 requests) instead of the previous 1 (trace all requests). Tracing all requests is inappropriate for most production systems #10774
Fix issue when stopping a Kong could error out if using Vault references #10775
Fix issue where Vault configuration stayed sticky and cached even when configurations were changed. #10776
Backported the openresty ngx.print chunk encoding buffer double free bug fix that leads to the corruption of chunk-encoded response data. #10816 #10824

Admin API

Fix an issue where empty value of URI argument custom_id crashes /consumer. #10475

Plugins

Request-Transformer: fix an issue where requests would intermittently be proxied with incorrect query parameters. 10539
Request Transformer: honor value of untrusted_lua configuration parameter #10327
OAuth2: fix an issue that OAuth2 token was being cached to nil while access to the wrong service first. #10522
OpenTelemetry: fix an issue that reconfigure of OpenTelemetry does not take effect. #10172
OpenTelemetry: fix an issue that caused spans to be propagated incorrectly resulting in a wrong hierarchy being rendered on tracing backends. #10663
gRPC gateway: null in the JSON payload caused an uncaught exception to be thrown during pb.encode. #10687
Oauth2: prevent an authorization code created by one plugin instance to be exchanged for an access token by a different plugin instance. #10011
gRPC gateway: fixed an issue that empty arrays in JSON are incorrectly encoded as "{}"; they are now encoded as "[]" to comply with standard. #10790

PDK

Fixed an issue for tracing PDK where sample rate does not work. #10485

Changed

Core

Postgres TTL cleanup timer will now only run on traditional and control plane nodes that have enabled the Admin API. #10405
Postgres TTL cleanup timer now runs a batch delete loop on each ttl enabled table with a number of 50.000 rows per batch. #10407
Postgres TTL cleanup timer now runs every 5 minutes instead of every 60 seconds. #10389
Postgres TTL cleanup timer now deletes expired rows based on database server-side timestamp to avoid potential problems caused by the difference of clock time between Kong and database server. #10389

PDK

request.get_uri_captures now returns the unnamed part tagged as an array (for jsonification). #10390

Plugins

Request-Termination: If the echo option was used, it would not return the uri-captures. #10390
OpenTelemetry: add http_response_header_for_traceid field in OpenTelemetry plugin. The plugin will set the corresponding header in the response if the field is specified with a string value. #10379

Dependencies

Bumped lua-resty-session from 4.0.2 to 4.0.3 #10338
Bumped lua-protobuf from 0.3.3 to 0.5.0 #10137 #10790
Bumped lua-resty-timer-ng from 0.2.3 to 0.2.5 #10419 #10664
Bumped lua-resty-openssl from 0.8.17 to 0.8.20 #10463 #10476
Bumped lua-resty-http from 0.17.0.beta.1 to 0.17.1 #10547
Bumped LuaSec from 1.2.0 to 1.3.1 #10528
Bumped lua-resty-acme from 0.10.1 to 0.11.0 #10562
Bumped lua-resty-events from 0.1.3 to 0.1.4 #10634
Bumped lua-kong-nginx-module from 0.5.1 to 0.6.0 #10288
Bumped lua-resty-lmdb from 1.0.0 to 1.1.0 #10766

3.2.0

Breaking Changes

Plugins

JWT: JWT plugin now denies a request that has different tokens in the jwt token search locations. #9946
Session: for sessions to work as expected it is required that all nodes run Kong >= 3.2.x. For that reason it is advisable that during upgrades mixed versions of proxy nodes run for as little as possible. During that time, the invalid sessions could cause failures and partial downtime. All existing sessions are invalidated when upgrading to this version. The parameter idling_timeout now has a default value of 900: unless configured differently, sessions expire after 900 seconds (15 minutes) of idling. The parameter absolute_timeout has a default value of 86400: unless configured differently, sessions expire after 86400 seconds (24 hours). #10199
Proxy Cache: Add wildcard and parameter match support for content_type #10209

Additions

Core

Expose postgres connection pool configuration. #9603
When router_flavor is traditional_compatible, verify routes created using the Expression router instead of the traditional router to ensure created routes are actually compatible. #9987
Nginx charset directive can now be configured with Nginx directive injections #10111
Services upstream TLS config is extended to stream subsystem. #9947
New configuration option ssl_session_cache_size to set the Nginx directive ssl_session_cache. This config defaults to 10m. Thanks Michael Kotten for contributing this change. #10021

Balancer

Add a new load-balancing algorithm option latency to the Upstream entity. This algorithm will choose a target based on the response latency of each target from prior requests. #9787

Plugins

Plugin: add an optional field instance_name that identifies a particular plugin entity. #10077
Zipkin: Add support to set the durations of Kong phases as span tags through configuration property config.phase_duration_flavor. #9891
HTTP logging: Suppport value of headers to be referenceable. #9948
AWS Lambda: Add aws_imds_protocol_version configuration parameter that allows the selection of the IMDS protocol version. Defaults to v1, can be set to v2 to enable IMDSv2. #9962
OpenTelemetry: Support scoping with services, routes and consumers. #10096
Statsd: Add tag_style configuration parameter that allows to send metrics with tags. Defaults to nil which means do not add any tags to the metrics. #10118
Session: now uses lua-resty-session v4.0.0 #10199

Admin API

In dbless mode, /config API endpoint can now flatten entity-related schema validation errors to a single array via the optional flatten_errors query parameter. Non-entity errors remain unchanged in this mode. #10161 #10256

PDK

Support for upstream_status field in log serializer. #10296

Fixes

Core

Add back Postgres FLOOR function when calculating ttl, so the returned ttl is always a whole integer. #9960
Fix an issue where after a valid declarative configuration is loaded, the configuration hash is incorrectly set to the value: 00000000000000000000000000000000. #9911
Update the batch queues module so that queues no longer grow without bounds if their consumers fail to process the entries. Instead, old batches are now dropped and an error is logged. #10247
Fix an issue where 'X-Kong-Upstream-Status' cannot be emitted when response is buffered. #10056

Plugins

Zipkin: Fix an issue where the global plugin's sample ratio overrides route-specific. #9877
JWT: Deny requests that have different tokens in the jwt token search locations. Thanks Jackson 'Che-Chun' Kuo from Latacora for reporting this issue. #9946
Statsd: Fix a bug in the StatsD plugin batch queue processing where metrics are published multiple times. #10052
Datadog: Fix a bug in the Datadog plugin batch queue processing where metrics are published multiple times. #10044
OpenTelemetry: Fix non-compliances to specification:
- For http.uri in spans. The field should be full HTTP URI. #10069
- For http.status_code. It should be present on spans for requests that have a status code. #10160
- For http.flavor. It should be a string value, not a double. #10160
OpenTelemetry: Fix a bug that when getting the trace of other formats, the trace ID reported and propagated could be of incorrect length. #10332
OAuth2: refresh_token_ttl is now limited between 0 and 100000000 by schema validator. Previously numbers that are too large causes requests to fail. #10068

Changed

Core

Improve error message for invalid JWK entities. #9904
Renamed two configuration properties:
- opentelemetry_tracing => tracing_instrumentations
- opentelemetry_tracing_sampling_rate => tracing_sampling_rate
The old opentelemetry_* properties are considered deprecated and will be fully removed in a future version of Kong. #10122 #10220

Hybrid Mode

Revert the removal of WebSocket protocol support for configuration sync, and disable the wRPC protocol. #9921

Dependencies

Bumped luarocks from 3.9.1 to 3.9.2 #9942
Bumped atc-router from 1.0.1 to 1.0.5 #9925 #10143 #10208
Bumped lua-resty-openssl from 0.8.15 to 0.8.17 #9583 #10144
Bumped lua-kong-nginx-module from 0.5.0 to 0.5.1 #10181
Bumped lua-resty-session from 3.10 to 4.0.2 #10199 #10230 #10308
Bumped OpenSSL from 1.1.1s to 1.1.1t #10266
Bumped lua-resty-timer-ng from 0.2.0 to 0.2.3 #10265

3.1.0

Breaking Changes

Core

Change the reponse body for a TRACE method from The upstream server responded with 405 to Method not allowed, make the reponse to show more clearly that Kong do not support TRACE method. #9448
Add allow_debug_header Kong conf to allow use of the Kong-Debug header for debugging. This option defaults to off. #10054 #10125

Additions

Core

Allow kong.conf ssl properties to be stored in vaults or environment variables. Allow such properties to be configured directly as content or base64 encoded content. #9253
Add support for full entity transformations in schemas #9431
Allow schema map type field being marked as referenceable. #9611
Add support for dynamically changing the log level #9744
Add keys entity to store and manage asymmetric keys. #9737
Add key-sets entity to group and manage keys #9737

Plugins

Rate-limiting: The HTTP status code and response body for rate-limited requests can now be customized. Thanks, @utix! #8930
Zipkin: add response_header_for_traceid field in Zipkin plugin. The plugin will set the corresponding header in the response if the field is specified with a string value. #9173
AWS Lambda: add requestContext field into awsgateway_compatible input data #9380
ACME: add support for Redis SSL, through configuration properties config.storage_config.redis.ssl, config.storage_config.redis.ssl_verify, and config.storage_config.redis.ssl_server_name. #9626
Session: Add new config cookie_persistent that allows browser to persist cookies even if browser is closed. This defaults to false which means cookies are not persistend across browser restarts. Thanks @tschaume for this contribution! #8187
Response-rate-limiting: add support for Redis SSL, through configuration properties redis_ssl (can be set to true or false), ssl_verify, and ssl_server_name. #8595 Thanks @dominikkukacka!
OpenTelemetry: add referenceable attribute to the headers field that could be stored in vaults. #9611
HTTP-Log: Support http_endpoint field to be referenceable #9714
rate-limiting: Add a new configuration sync_rate to the redis policy, which synchronizes metrics to redis periodically instead of on every request. #9538

Hybrid Mode

Data plane node IDs will now persist across restarts. #9067
Add HTTP CONNECT forward proxy support for Hybrid Mode connections. New configuration options cluster_use_proxy, proxy_server and proxy_server_ssl_verify are added. #9758 #9773

Performance

Increase the default value of lua_regex_cache_max_entries, a warning will be thrown when there are too many regex routes and router_flavor is traditional. #9624
Add batch queue into the Datadog and StatsD plugin to reduce timer usage. #9521

PDK

Extend kong.client.tls.request_client_certificate to support setting the Distinguished Name (DN) list hints of the accepted CA certificates. #9768

Fixes

Core

Fix issue where external plugins crashing with unhandled exceptions would cause high CPU utilization after the automatic restart. #9384
Fix issue where Zipkin plugin cannot parse OT baggage headers due to invalid OT baggage pattern. #9280
Add use_srv_name options to upstream for balancer. #9430
Fix issue in header_filter instrumentation where the span was not correctly created. #9434
Fix issue in router building where when field contains an empty table, the generated expression is invalid. #9451
Fix issue in router rebuilding where when paths field is invalid, the router's mutex is not released properly. #9480
Fixed an issue where kong docker-start would fail if KONG_PREFIX was set to a relative path. #9337
Fixed an issue with error-handling and process cleanup in kong start. #9337

Hybrid Mode

Fixed a race condition that can cause configuration push events to be dropped when the first data-plane connection is established with a control-plane worker. #9616

CLI

Fix slow CLI performance due to pending timer jobs #9536

Admin API

Increase the maximum request argument number from 100 to 1000, and return 400 error if request parameters reach the limitation to avoid being truncated. #9510
Paging size parameter is now propogated to next page if specified in current request. #9503
Non-normalized prefix route path is now rejected. It will also suggest how to write the path in normalized form. #9760

PDK

Added support for kong.request.get_uri_captures (kong.request.getUriCaptures) #9512
Fixed parameter type of kong.service.request.set_raw_body (kong.service.request.setRawBody), return type of kong.service.response.get_raw_body(kong.service.request.getRawBody), and body parameter type of kong.response.exit to bytes. Note that old version of go PDK is incompatible after this change. #9526
Vault will not call semaphore:wait in init or init_worker phase. #9851

Plugins

Add missing protocols field to various plugin schemas. #9525
AWS Lambda: Fix an issue that is causing inability to read environment variables in ECS environment. #9460
Request-Transformer: fix a bug when header renaming will override existing header and cause unpredictable result. #9442
OpenTelemetry:
- Fix an issue that the default propagation header is not configured to w3c correctly. #9457
- Replace the worker-level table cache with BatchQueue to avoid data race. #9504
- Fix an issue that the parent_id is not set on the span when propagating w3c traceparent. #9628
Response-Transformer: Fix the bug that Response-Transformer plugin breaks when receiving an unexcepted body. #9463
HTTP-Log: Fix an issue where queue id serialization does not include queue_size and flush_timeout. #9789

Changed

Hybrid Mode

The legacy hybrid configuration protocol has been removed in favor of the wRPC protocol introduced in 3.0. #9740

Dependencies

Bumped openssl from 1.1.1q to 1.1.1s #9674
Bumped atc-router from 1.0.0 to 1.0.1 #9558
Bumped lua-resty-openssl from 0.8.10 to 0.8.15 #9583 #9600 #9675
Bumped lyaml from 6.2.7 to 6.2.8 #9607
Bumped lua-resty-acme from 0.8.1 to 0.9.0 #9626
Bumped resty.healthcheck from 1.6.1 to 1.6.2 #9778
Bumped pgmoon from 1.15.0 to 1.16.0 #9815

3.0.1

Fixes

Core

Fix issue where Zipkin plugin cannot parse OT baggage headers due to invalid OT baggage pattern. #9280
Fix issue in header_filter instrumentation where the span was not correctly created. #9434
Fix issue in router building where when field contains an empty table, the generated expression is invalid. #9451
Fix issue in router rebuilding where when paths field is invalid, the router's mutex is not released properly. #9480
Fixed an issue where kong docker-start would fail if KONG_PREFIX was set to a relative path. #9337
Fixed an issue with error-handling and process cleanup in kong start. #9337

This major release adds a new router written in Rust and a tracing API that is compatible with the OpenTelemetry API spec. Furthermore, various internal changes have been made to improve Kong's performance and memory consumption. As it is a major release, users are advised to review the list of braking changes to determine whether configuration changes are needed when upgrading.

Breaking Changes

Deployment

Blue-green deployment from Kong earlier than 2.1.0 is not supported, upgrade to 2.1.0 or later before upgrading to 3.0.0 to have blue-green deployment. Thank you @marc-charpentier for reporting issue and proposing a pull-request. #8896
Deprecate/stop producing Amazon Linux (1) containers and packages (EOLed December 31, 2020) Kong/docs.konghq.com #3966
Deprecate/stop producing Debian 8 "Jessie" containers and packages (EOLed June 2020) Kong/kong-build-tools #448 Kong/kong-distributions #766

Core

Kong schema library's process_auto_fields function will not any more make a deep copy of data that is passed to it when the given context is "select". This was done to avoid excessive deep copying of tables where we believe the data most of the time comes from a driver like pgmoon or lmdb. If a custom plugin relied on process_auto_fields not overriding the given table, it must make its own copy before passing it to the function now. #8796
The deprecated shorthands field in Kong Plugin or DAO schemas was removed in favor or the typed shorthand_fields. If your custom schemas still use shorthands, you need to update them to use shorthand_fields. #8815
The support for legacy = true/false attribute was removed from Kong schemas and Kong field schemas. #8958
The deprecated alias of Kong.serve_admin_api was removed. If your custom Nginx templates still use it, please change it to Kong.admin_content. #8815
The Kong singletons module "kong.singletons" was removed in favor of the PDK kong.*. #8874
The dataplane config cache was removed. The config persistence is now done automatically with LMDB. #8704
ngx.ctx.balancer_address does not exist anymore, please use ngx.ctx.balancer_data instead. #9043
We have changed the normalization rules for route.path: Kong stores the unnormalized path, but regex path always pattern matches with the normalized URI. We used to replace percent-encoding in regex path pattern to ensure different forms of URI matches. That is no longer supported. Except for reserved characters defined in rfc3986, we should write all other characters without percent-encoding. #9024
Kong will no longer use an heuristic to guess whether a route.path is a regex pattern. From now 3.0 onwards, all regex paths must start with the "~" prefix, and all paths that don't start with "~" will be considered plain text. The migration process should automatically convert the regex paths when upgrading from 2.x to 3.0 #9027
Bumping version number (_format_version) of declarative configuration to "3.0" for changes on route.path. Declaritive configuration with older version are upgraded to "3.0" on the fly. #9078
Removed deprecated config.functions from serverless-functions plugin's schema, please use config.access phase instead. #8559
Tags may now contain space characters. #9143
The Secrets Management feature, which has been in beta since release 2.8.0, is now included as a regular feature. #8871 #9217

Admin API

POST requests on Targets endpoint are no longer able to update existing entities, they are only able to create new ones. #8596, #8798. If you have scripts that use POST requests to modify Targets, you should change them to PUT requests to the appropriate endpoints before updating to Kong 3.0.
Insert and update operations on duplicated Targets returns 409. #8179, #8768
The list of reported plugins available on the server now returns a table of metadata per plugin instead of a boolean true. #8810

PDK

The kong.request.get_path() PDK function now performs path normalization on the string that is returned to the caller. The raw, non-normalized version of the request path can be fetched via kong.request.get_raw_path(). #8823
pdk.response.set_header(), pdk.response.set_headers(), pdk.response.exit() now ignore and emit warnings for manually set Transfer-Encoding headers. #8698
The PDK is no longer versioned #8585
The JavaScript PDK now returns Uint8Array for kong.request.getRawBody, kong.response.getRawBody and kong.service.response.getRawBody. The Python PDK returns bytes for kong.request.get_raw_body, kong.response.get_raw_body, kong.service.response.get_raw_body. All these funtions used to return strings in the past. #8623

Plugins

DAOs in plugins must be listed in an array, so that their loading order is explicit. Loading them in a hash-like table is no longer supported. #8988
Plugins MUST now have a valid PRIORITY (integer) and VERSION ("x.y.z" format) field in their handler.lua file, otherwise the plugin will fail to load. #8836
The old kong.plugins.log-serializers.basic library was removed in favor of the PDK function kong.log.serialize, please upgrade your plugins to use PDK. #8815
The support for deprecated legacy plugin schemas was removed. If your custom plugins still use the old (0.x era) schemas, you are now forced to upgrade them. #8815
Some plugins received new priority values. This is important for those who run custom plugins as it may affect the sequence your plugins are executed. Note that this does not change the order of execution for plugins in a standard kong installation. List of plugins and their old and new priority value:
- acme changed from 1007 to 1705
- basic-auth changed from 1001 to 1100
- hmac-auth changed from 1000 to 1030
- jwt changed from 1005 to 1450
- key-auth changed from 1003 to 1250
- ldap-auth changed from 1002 to 1200
- oauth2 changed from 1004 to 1400
- rate-limiting changed from 901 to 910
HTTP-log: headers field now only takes a single string per header name, where it previously took an array of values #6992
AWS Lambda: aws_region field must be set through either plugin config or environment variables, allow both host and aws_region fields, and always apply SigV4 signature. #8082
Serverless Functions Removed deprecated config.functions, please use config.access instead. #8559
Serverless Functions: The pre-functions plugin changed priority from +inf to 1000000. #8836
JWT: The authenticated JWT is no longer put into the nginx context (ngx.ctx.authenticated_jwt_token). Custom plugins which depend on that value being set under that name must be updated to use Kong's shared context instead (kong.ctx.shared.authenticated_jwt_token) before upgrading to 3.0
Prometheus: The prometheus metrics have been reworked extensively for 3.0.
- Latency has been split into 4 different metrics: kong_latency_ms, upstream_latency_ms and request_latency_ms (http) /tcp_session_duration_ms (stream). Buckets details below.
- Separate out Kong Latency Bucket values and Upstream Latency Bucket values.
- consumer_status removed.
- request_count and consumer_status have been merged into just http_requests_total. If the per_consumer config is set false, the consumer label will be empty. If the per_consumer config is true, it will be filled.
- http_requests_total has a new label source, set to either exit, error or service.
- New Metric: node_info. Single gauge set to 1 that outputs the node's id and kong version.
- All Memory metrics have a new label node_id
- nginx_http_current_connections merged with nginx_stream_current_connection into nginx_current_connections #8712
Prometheus: The plugin doesn't export status codes, latencies, bandwidth and upstream healthcheck metrics by default. They can still be turned on manually by setting status_code_metrics, latency_metrics, bandwidth_metrics and upstream_health_metrics respectively. Enabling those metrics will impact the performance if you have a large volume of Kong entities, we recommend using the statsd plugin with the push model if that is the case. And now prometheus plugin new grafana dashboard updated #9028
ACME: allow_any_domain field added. It is default to false and if set to true, the gateway will ignore the domains field. #9047
Statsd:
- The metric name that is related to the service has been renamed by adding a service. prefix. e.g. kong.service.<service_identifier>.request.count #9046
- The metric kong.<service_identifier>.request.status.<status> and kong.<service_identifier>.user.<consumer_identifier>.request.status.<status> has been renamed to kong.service.<service_identifier>.status.<status> and kong.service.<service_identifier>.user.<consumer_identifier>.status.<status> #9046
- The metric *.status.<status>.total from metrics status_count and status_count_per_user has been removed #9046
Proxy-cache: The plugin does not store the response data in ngx.ctx.proxy_cache_hit anymore. Logging plugins that need the response data must read it from kong.ctx.shared.proxy_cache_hit from Kong 3.0 on. #8607
Rate-limiting: The default policy is now local for all deployment modes. #9344
Response-rate-limiting: The default policy is now local for all deployment modes. #9344

Deprecations

The go_pluginserver_exe and go_plugins_dir directives are no longer supported. #8552. If you are using Go plugin server, please migrate your plugins to use the Go PDK before upgrading.
The migration helper library (mostly used for Cassandra migrations) is no longer supplied with Kong #8781
The path_handling algorithm v1 is deprecated and only supported when router_flavor config option is set to traditional. #9290

Configuration

The Kong constant CREDENTIAL_USERNAME with value of X-Credential-Username was removed. Kong plugins in general have moved (since #5516) to use constant CREDENTIAL_IDENTIFIER with value of X-Credential-Identifier when setting the upstream headers for a credential. #8815
Change the default of lua_ssl_trusted_certificate to system #8602 to automatically load trusted CA list from system CA store.
Remove a warning of AAAA being experimental with dns_order.
It is no longer possible to use a .lua format to import a declarative config from the kong command-line tool, only json and yaml are supported. If your update procedure with kong involves executing kong config db_import config.lua, please create a config.json or config.yml and use that before upgrading. #8898
We bumped the version number (_format_version) of declarative configuration to "3.0" because of changes on route.path. Declarative configuration with older version shoudl be upgraded to "3.0" on the fly. #9078

Migrations

Postgres migrations can now have an up_f part like Cassandra migrations, designating a function to call. The up_f part is invoked after the up part has been executed against the database for both Postgres and Cassandra.
A new CLI command, kong migrations status, generates the status on a JSON file.

Dependencies

Bumped OpenResty from 1.19.9.1 to 1.21.4.1 #8850
Bumped pgmoon from 1.13.0 to 1.15.0 #8908 #8429
Bumped OpenSSL from 1.1.1n to 1.1.1q #9074 #8544 #8752 #8994
Bumped resty.openssl from 0.8.8 to 0.8.10 #8592 #8753 #9023
Bumped inspect from 3.1.2 to 3.1.3 #8589
Bumped resty.acme from 0.7.2 to 0.8.1 #8680 #9165
Bumped luarocks from 3.8.0 to 3.9.1 #8700 #9204
Bumped luasec from 1.0.2 to 1.2.0 #8754 #8754
Bumped resty.healthcheck from 1.5.0 to 1.6.1 #8755 #9018 #9150
Bumped resty.cassandra from 1.5.1 to 1.5.2 #8845
Bumped penlight from 1.12.0 to 1.13.1 #9206
Bumped lua-resty-mlcache from 2.5.0 to 2.6.0 #9287

Additions

Performance

Do not register unnecessary event handlers on Hybrid mode Control Plane nodes #8452.
Use the new timer library to improve performance, except for the plugin server. #8912
Increased use of caching for DNS queries by activating additional_section by default #8895
pdk.request.get_header changed to a faster implementation, not to fetch all headers every time it's called #8716
Conditional rebuilding of router, plugins iterator and balancer on DP #8519, #8671
Made config loading code more cooperative by yielding #8888
Use LuaJIT encoder instead of JSON to serialize values faster in LMDB #8942
Move inflating and JSON decoding non-concurrent, which avoids blocking and makes DP reloads faster #8959
Stop duplication of some events #9082
Improve performance of config hash calculation by using string buffer and tablepool #9073
Reduce cache usage in dbless by not using the kong cache for Routes and Services in LMDB #8972

Core

Implemented delayed response in stream mode #6878
Added cache_key on target entity for uniqueness detection. #8179
Introduced the tracing API which compatible with OpenTelemetry API spec and add build-in instrumentations. The tracing API is intend to be used with a external exporter plugin. Build-in instrumentation types and sampling rate are configuable through opentelemetry_tracing and opentelemetry_tracing_sampling_rate options. #8724
Added path, uri_capture, and query_arg options to upstream hash_on for load balancing. #8701
Introduced unix domain socket based lua-resty-events to replace shared memory based lua-resty-worker-events. #8890
Introduced a new router implementation atc-router, which is written in Rust. #8938
Introduce a new field for entities table_name that allows to specify a table name. Before the name was deduced by the entity name attribute. #9182
Added headers on active healthcheck for upstreams. #8255
Target entities using hostnames were resolved when they were not needed. Now when a target is removed or updated, the DNS record associated with it is removed from the list of hostnames to be resolved. #8497 9265
Improved error handling and debugging info in the DNS code #8902
Kong will now attempt to recover from an unclean shutdown by detecting and removing dangling unix sockets in the prefix directory #9254

Admin API

Added a new API /timers to get the timer statistics. #8912 and worker info #8999
/ endpoint now includes plugin priority #8821

Hybrid Mode

Add wRPC protocol support. Now configuration synchronization is over wRPC. wRPC is an RPC protocol that encodes with ProtoBuf and transports with WebSocket. #8357
To keep compatibility with earlier versions, add support for CP to fall back to the previous protocol to support old DP. #8834
Add support to negotiate services supported with wRPC protocol. We will support more services than config sync over wRPC in the future. #8926
Declarative config exports happen inside a transaction in Postgres #8586

Plugins

Sync all plugin versions to the Kong version #8772
Introduced the new OpenTelemetry plugin that export tracing instrumentations to any OTLP/HTTP compatible backend. opentelemetry_tracing configuration should be enabled to collect the core tracing spans of Kong. #8826
Zipkin: add support for including HTTP path in span name through configuration property http_span_name. #8150
Zipkin: add support for socket connect and send/read timeouts through configuration properties connect_timeout, send_timeout, and read_timeout. This can help mitigate ngx.timer saturation when upstream collectors are unavailable or slow. #8735
AWS-Lambda: add support for cross account invocation through configuration properties aws_assume_role_arn and aws_role_session_name.#8900 #8900
AWS-Lambda: accept string type statusCode as valid return when working in proxy integration mode. #8765
AWS-Lambda: separate aws credential cache by IAM role ARN #8907
Statsd: 🎆 Newly open-sourced plugin capabilities: All capabilities of Statsd Advanced are now bundled in Statsd. #9046

Configuration

A new configuration item (openresty_path) has been added to allow developers/operators to specify the OpenResty installation to use when running Kong (instead of using the system-installed OpenResty) #8412
Add ipv6only to listen options (e.g. KONG_PROXY_LISTEN) #9225
Add so_keepalive to listen options (e.g. KONG_PROXY_LISTEN) #9225
Add LMDB dbless config persistence and removed the JSON based config cache for faster startup time #8670
nginx_events_worker_connections=auto has a lower bound of 1024 #9276
nginx_main_worker_rlimit_nofile=auto has a lower bound of 1024 #9276

PDK

Added new PDK function: kong.request.get_start_time() #8688
kong.db.*.cache_key() falls back to .id if nothing from cache_key is found #8553

Fixes

Core

The schema validator now correctly converts null from declarative configurations to nil. #8483
Only reschedule router and plugin iterator timers after finishing previous execution, avoiding unnecessary concurrent executions. #8567
External plugins now handle returned JSON with null member correctly. #8611
Fixed an issue where the address of the environ variable could change but the code didn't assumed it was fixed after init #8581
Fix issue where the Go plugin server instance would not be updated after a restart (e.g., upon a plugin server crash). #8547
Fixed an issue on trying to reschedule the DNS resolving timer when Kong was being reloaded. #8702
The private stream API has been rewritten to allow for larger message payloads #8641
Fixed an issue that the client certificate sent to upstream was not updated when calling PATCH Admin API #8934
Fixed an issue where the CP and wRPC modules would cause Kong to crash when calling export_deflated_reconfigure_payload without a pcall #8668
Moved all .proto files to /usr/local/kong/include and ordered by priority. #8914
Fixed an issue that cause unexpected 404 error on creating/updating configs with invalid options #8831
Fixed an issue that causes crashes when calling some PDK APIs #8604
Fixed an issue that cause crashes when go PDK calls return arrays #8891
Plugin servers now shutdowns gracefully when Kong exits #8923
CLI now prompts with [y/n] instead of [Y/n], as it does not take y as default #9114
Improved the error message when Kong cannot connect to Cassandra on init #8847
Fixed an issue where Vault Subschema wasn't loaded in off strategy #9174
The Schema now runs select transformations before process_auto_fields #9049
Fixed an issue where Kong would use too many timers to keep track of upstreams when worker_consistency=eventual #8694, #8858
Fixed an issue where it wasn't possible to set target status using only a hostname for targets set only by their hostname #8797
Fixed pagination issue when getting to the second page while iterationg over a foreign key field using the DAO #9255
Fixed an issue where cache entries of some entities were not being properly invalidated after a cascade delete #9261
Running kong start when Kong is already running will no longer clobber the existing .kong_env file #9254

Admin API

Support HTTP/2 when requesting /status #8690

Plugins

Plugins with colliding priorities have now deterministic sorting based on their name #8957
External Plugins: better handling of the logging when a plugin instance loses the instances_id in an event handler #8652
ACME: auth_method default value is set to token #8565
ACME: Added cache for domains_matcher #9048
syslog: conf.facility default value is now set to user #8564
AWS-Lambda: Removed proxy_scheme field from schema #8566
AWS-Lambda: Change path from request_uri to upstream_uri, fix uri can not follow the rule defined in the request-transformer configuration #9058 #9129
hmac-auth: Removed deprecated signature format using ngx.var.uri #8558
Remove deprecated blacklist/whitelist config fields from bot-detection, ip-restriction and ACL plugins. #8560
Zipkin: Correct the balancer spans' duration to include the connection time from Nginx to the upstream. #8848
Zipkin: Correct the calculation of the header filter start time #9230
Zipkin: Compatibility with the latest Jaeger header spec, which makes parent_id optional #8352
LDAP-Auth: Refactored ASN.1 parser using OpenSSL API through FFI. #8663
Rate-Limiting and Response-ratelimiting: Fix a disordered behaviour caused by pairs function which may cause Postgres DEADLOCK problem #8968
Response-rate-Limiting: Fix a disordered behaviour caused by pairs function which may cause Postgres DEADLOCK problem #8968
gRPC gateway: Fix the handling of boolean fields from URI arguments #9180
Serverless Functions: Fix problem that could result in a crash #9269
Azure-functions: Support working without dummy service #9177

Clustering

The cluster listener now uses the value of admin_error_log for its log file instead of proxy_error_log #8583
Fixed a typo in some business logic that checks the Kong role before setting a value in cache at startup #9060
Fixed DP get zero size config while service with plugin-enabled route is disabled #8816
Localize config_version to avoid a race condition from the new yielding config loading code #8188

PDK

kong.response.get_source() now return an error instead of an exit when plugin throws runtime exception on access phase #8599
kong.tools.uri.normalize() now does escaping of reserved and unreserved characters more correctly #8140

Previous releases

Please see CHANGELOG-OLD.md file for < 3.0 releases.

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Table of Contents

Unreleased

Additions

Core

Plugins

Fixes

Core

Plugins

Dependencies

3.4.0

Breaking Changes

Deprecations

Additions

Core

Kong Manager

Plugins

Performance

Fixes

Core

Admin API

Plugins

Changed

Core

Status API

Dependencies

Known Issues

3.3.0

Breaking Changes

Core

Plugins

Additions

Core

Admin API

Status API

Plugins

PDK

Fixes

Core

Admin API

Plugins

PDK

Changed

Core

PDK

Plugins

Dependencies

3.2.0

Breaking Changes

Plugins

Additions

Core

Balancer

Plugins

Admin API

PDK

Fixes

Core

Plugins

Changed

Core

Hybrid Mode

Dependencies

3.1.0

Breaking Changes

Core

Additions

Core

Plugins

Hybrid Mode

Performance

PDK

Fixes

Core

Hybrid Mode