Envoy metrics service receiver: support adapter listener metrics.

[wankai123]

• If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes #.
• Update the CHANGES log.

[Copilot]

Pull request overview

This pull request adds support for Envoy listener metrics to the Envoy metrics service receiver. The implementation follows a similar pattern to the existing cluster metrics adapter by introducing a new ListenerMetricsAdapter class that normalizes listener metric names to envoy_listener_metrics and preserves the original metric name as a label.

Changes:

• Added ListenerMetricsAdapter class to adapt Envoy listener metrics
• Integrated listener metrics handling into ProtoMetricFamily2MetricsAdapter
• Updated MetricServiceGRPCHandler to use the new listener metrics adapter

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
oap-server/server-receiver-plugin/envoy-metrics-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/envoy/metrics/adapters/ListenerMetricsAdapter.java	New adapter class that normalizes listener metric names and adds metrics_name label
oap-server/server-receiver-plugin/envoy-metrics-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/envoy/metrics/adapters/ProtoMetricFamily2MetricsAdapter.java	Added listener metrics adapter field and routing logic for listener. prefix
oap-server/server-receiver-plugin/envoy-metrics-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/envoy/MetricServiceGRPCHandler.java	Updated to instantiate ListenerMetricsAdapter when creating ProtoMetricFamily2MetricsAdapter
oap-server/server-receiver-plugin/envoy-metrics-receiver-plugin/src/test/java/org/apache/skywalking/oap/server/receiver/envoy/ListenerMetricsAdapterTest.java	Test coverage for listener metrics adapter with various metric name patterns
oap-server/server-receiver-plugin/envoy-metrics-receiver-plugin/src/test/java/org/apache/skywalking/oap/server/receiver/envoy/ClusterManagerMetricsAdapterTest.java	Added test case for SSL certificate metrics
docs/en/changes/changes.md	Updated changelog to document the new feature

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