* Follow protocol grammar fix `GCPhrase -> GCPhase`

* Fix doc.

* Support `!= null` in OAL engine.
* Add `Message Queue Consuming Count` metric for MQ consuming service and endpoint.
* Add `Message Queue Avg Consuming Latency` metric for MQ consuming service and endpoint.
* Document with a new menu in the `tracing` catalog is added

* [maven-release-plugin] prepare release v8.8.0

* [maven-release-plugin] prepare for next development iteration

* Create changes-8.8.0.md

* Reset changelog for 8.9.0

Fix dynamic configuration watch implementation current value not null when the config is deleted. (#7606)

* Fix dynamic configuration watch implementation current value not null when the config is deleted.

* add changes.md

* fix LoggingConfigWatcher watch.vale, and when value = null ,config not reset.

* fix

* fix style

* Update oap-server/analyzer/agent-analyzer/src/main/java/org/apache/skywalking/oap/server/analyzer/provider/trace/UninstrumentedGatewaysConfig.java
Co-authored-by: Nkezhenxu94 <kezhenxu94@apache.org>

* use Strings.nullToEmpty
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>
Co-authored-by: Nkezhenxu94 <kezhenxu94@apache.org>

* Support grouped dynamic configurations in DCS.
Support zookeeper grouped dynamic configurations.

* change to @Slf4j
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

* fix: Fix MultiScopesAnalysisListener#setPublicAttrs log warn frequently. #6562

1. Rename current STATUS_CODE to HTTP_RESPONSE_STATUS_CODE, real tag key should be http.status_code.
2. Add a new string tag RPC_RESPONSE_STATUS_CODE to hold all string type value tag. The key is `rpc.status_code`.
3. At the backend, keep responseCode for HTTP_RESPONSE_STATUS_CODE tag, but add @Deprecated. Also, add httpResponseStatusCode(a duplicate of responseCode) and rpcStatusCode(for RPC_RESPONSE_STATUS_CODE) fields for OAL.

* Modify `Tags.STATUS_CODE` field name to `Tags.HTTP_RESPONSE_STATUS_CODE` and type from `StringTag` to `IntegerTag`, add `Tags.RPC_RESPONSE_STATUS_CODE` field to hold rpc response code value.

* Add `rpcStatusCode` for `rpc.status_code` tag in the OAL objects. The `responseCode` field is marked as deprecated and replaced by `httpResponseStatusCode` field. 

* Tag `status_code` is still supported in the backend for forward compatbility. Will be removed one year later.
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

* Remove page path in the browser log query condition.

* Remove endpoint name in the backend log query condition.

* [Break Change] Remove endpoint name in the trace query condition.

* Fix a local UT error(MacOS only)

Support Metric level function `serviceRelation` in `MAL` and binding  envoy metrics into the topology. (#7399)

* Support Metric level function `serviceRelation` in `MAL`.
* Support envoy metrics binding into the topology.
* add istio args
* remove istio 1.7
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>
Co-authored-by: NJared Tan <jian.tan@daocloud.io>
Co-authored-by: NZhenxu <kezhenxu94@apache.org>

* [maven-release-plugin] prepare release v8.7.0

* [maven-release-plugin] prepare for next development iteration

Fix IllegalArgumentException in PrometheusMetricConverter and NaN value samples in SampleFamily (#7349)

Groovy naturally supports many dynamic features that we don't benefit for now but cost performance loss, in this patch we compile our Groovy-based DSL scripts statically to optimize performance.

The possible metrics names are relatively fixed in an OAP run, we previously always escape the metrics names, building a new regex Pattern from scratch, which is cpu-consuming.

In this patch, I cache the escaped metrics names, and if it missed, use a pre-compiled regex Pattern to escape the metrics name.

This patch also replace string concatenation `+` with `StringBuilder` in generated classes, which won't get optimized by Java compiler

This may reduce 1~1.5 vCPU under 20K RPS environment.

* OAL supports generating metrics from events

* Add new dashboard for event metrics

* Add some docs for event metrics

* polish debug logging avoid null value.

* update CHANGES.md.