Support hot-reloading of Ditto HOCON configuration via Kubernetes ConfigMap file watching#2369
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…figMap file watching Adds a DynamicConfigWatcherActor that polls a ConfigMap-mounted file for changes, merges dynamic config with the static config, and notifies consumers via two patterns: - EventStream-based DynamicConfigChanged events for singleton/low-count actors - DynamicConfigPoller utility for high-volume sharded actors (version-polling pattern) Config values that can now be changed without pod restart include namespace-scoped activity checks, custom metrics, entity creation restrictions, gateway authentication (OAuth issuers, DevOps auth, pre-authentication), streaming config, background sync, persistence cleanup, and WoT ThingModel validation. Includes Helm chart changes to support a separate dynamic ConfigMap (without checksum annotation, so updates don't trigger pod restarts) and version-keyed parsed config caching in DynamicConfigWatcherExtension to minimize memory overhead across 500K+ sharded actor instances. Closes: eclipse-ditto#2366 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Adds a DynamicConfigWatcherActor that polls a ConfigMap-mounted file for changes, merges dynamic config with the static config, and notifies consumers via two patterns:
Config values that can now be changed without pod restart include namespace-scoped activity checks, custom metrics, entity creation restrictions, gateway authentication (OAuth issuers, DevOps auth, pre-authentication), streaming config, background sync, persistence cleanup, and WoT ThingModel validation.
Includes Helm chart changes to support a separate dynamic ConfigMap (without checksum annotation, so updates don't trigger pod restarts) and version-keyed parsed config caching in DynamicConfigWatcherExtension to minimize memory overhead across 500K+ sharded actor instances.
Resolves: #2366