General topic: stability, resilience, recoverability, better logging and error handling.
New features:
* JSON logging with `--log-format=json`. 544
* Plain-text logging `--log-format=plain`. 544
Bugfixes:
* On-field handlers were triggered for non-existent fields with `None`→`None` change. 523
* Sub-handlers' state was not purged, preventing their execution in the future. 517
Resilience improvements:
* Annotations from other Kopf-based operators are fully ignored to avoid ping-pong effects. 539 538
* The operator will force-stop itself by SIGKILL after 10 minutes of attempts to stop gracefully. 543
* Crash the whole operator on unrecoverable errors in watchers/workers. 509
* Throttle individual resource processing on unexpected errors. 510
* Extra exceptions are intercepted and ignored for k8s-event posting. 507
* Treat client timeouts during watches similar to other API errors. 506
* Handle all connection errors from the initial streaming request. 512
Experience improvements:
* Annotations restrictions on key length are reworked to allow longer names (v2/v1 keys). 529
* Annotations values are now compacted (no spaces) for the better visual outlook. 516
* Log/warn when the resulting patched object does not match the intended patch. 527
* Filtered-out resources do not create phantom logs & do not get annotated anymore. 545
* Cluster-scoped objects are logged by their name, without "None" as the namespace. 544
* Better phrasing for some log messages to avoid confusion. 540
* Documentation fixes. 530
Internal changes:
* The first release since the fork. 502 500 505 546
* CI feedback is sped up from ≈40-50 mins to ≈5 mins per push. 536 537
* K3d/K3s is used for CI functional/integration testing; Minikube is for nightly tests. 536 547
* K8s versions are updated for CI builds. 501
* Imports are sorted with `isort`. 525 531
* Added tests for operators' peering. 519
* Added tests for logging & loggers. 544
* Get rid of mocks for causes & registries, use normal classes. 521
* Time-based tests are stabilised (though not fully fixed). 534 528 520 522
* Asyncio tasks are now named in Python 3.8+, which makes the debugging easier. 542