Configuration keys

Every otlp.metric.reporter.* key of monedula-metrics-reporter 0.10.0: type, default, and whether it can change at runtime.

All keys start with otlp.metric.reporter..

Keys

Key	Type	Default	Description
`otlp.metric.reporter.endpoint`	String	`http://localhost:4317 (grpc), http://localhost:4318 (http)`	OTLP collector endpoint. The default follows transport: gRPC uses :4317, HTTP uses :4318. For grpc, use the collector gRPC endpoint such as http://collector:4317. For http, a bare collector root such as http://collector:4318 is normalized to http://collector:4318/v1/metrics; custom paths are used as provided.
`otlp.metric.reporter.transport`	Enum (`grpc` \| `http`)	`grpc`	OTLP transport: grpc or http.
`otlp.metric.reporter.interval.ms`	Long	`30000`	Export interval in milliseconds.
`otlp.metric.reporter.timeout.ms`	Long	`5000`	Per-export call timeout in milliseconds. Must be less than otlp.metric.reporter.interval.ms.
`otlp.metric.reporter.allowed.metrics`	List	empty	Comma-separated regex patterns used for allow-listing metrics. SPI metrics are matched against {group}.{name}; Yammer metrics are matched against {group}.{type}.{name}. Empty = allow all; an invalid pattern is logged at ERROR and the reporter runs as no-op so Kafka stays up. Changeable at runtime in builds from main (not yet released).
`otlp.metric.reporter.resource.attributes`	String	empty	Extra OTLP resource attributes: key=value,key=value.
`otlp.metric.reporter.headers`	String	empty	Static OTLP request headers as Header-Name=value,Other=value. Use this for collector auth such as bearer tokens or API keys. Header values may contain =, but commas are treated as separators.
`otlp.metric.reporter.compression`	Enum (`none` \| `gzip`)	`none`	OTLP exporter compression: none or gzip.
`otlp.metric.reporter.trusted.certificates.path`	String	empty	Optional path to a PEM CA bundle used to trust the collector TLS certificate.
`otlp.metric.reporter.client.certificate.path`	String	empty	Optional path to a PEM client certificate for mTLS. Must be configured together with otlp.metric.reporter.client.key.path.
`otlp.metric.reporter.client.key.path`	String	empty	Optional path to a PEM client private key for mTLS. Must be configured together with otlp.metric.reporter.client.certificate.path.
`otlp.metric.reporter.jvm.metrics.enabled`	Boolean	`true`	Whether to also export JVM runtime metrics via OpenTelemetry's runtime instrumentation library. Disable if you scrape JVM metrics elsewhere.
`otlp.metric.reporter.client.telemetry.enabled`	Boolean	`true`	Enable the KIP-714 client-telemetry receiver. Auto-active on brokers but inert until a client-metrics subscription exists; false makes the broker not advertise the capability at all.
`otlp.metric.reporter.client.telemetry.enrich.broker`	Boolean	`true`	Attach broker identity (kafka_cluster_id / kafka_node_id) to forwarded client metrics so they join broker series in PromQL. Changeable at runtime in builds from main (not yet released).
`otlp.metric.reporter.client.telemetry.enrich.client.identity`	Boolean	`false`	Also attach the authenticated principal (kafka_client_principal) and client address (kafka_client_address). High-cardinality / PII - opt in deliberately. Changeable at runtime in builds from main (not yet released); there, turning it on at runtime adds the labels only if the broker started with it set to true.
`otlp.metric.reporter.client.telemetry.enrich.client.id`	Boolean	`true`	Attach the client's client_id (from the request context) as a label, so client metrics can be grouped per application. Moderate cardinality; on by default. Changeable at runtime in builds from main (not yet released).
`otlp.metric.reporter.client.telemetry.enrich.client.instance.id`	Boolean	`false`	Attach the KIP-714 client_instance_id (a per-client-instance UUID) as a label. High cardinality - opt in deliberately. Changeable at runtime in builds from main (not yet released).
`otlp.metric.reporter.client.telemetry.queue.capacity`	Int	`1024`	Bounded in-memory queue for inbound client pushes; overflow drops the payload (counted in monedula_reporter_clienttelemetry_dropped_total).