KIP-877 — Mechanism for plugins and connectors to register metrics

Accepted Kafka 4.1 MetricsConnect

Adds a MetricsRegistry to the plugin configuration context so that Kafka plugins (partitioners, interceptors, Connect connectors, etc.) can register metrics that inherit parent component tags and reporters. Plugins that created their own Metrics instances got no parent tags, no reporter integration, and caused failures with singleton reporters like CruiseControlMetricsReporter when instantiated multiple times.

Details