OAP gRPC-Client support Health Check and [Break Change] Health Check make response 1 represents healthy, 0 represents unhealthy.

[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 updates the health check implementation across several components to flip the healthy/unhealthy score such that a score of 1 represents healthy and 0 represents unhealthy. Key changes include updating the gauge metric description, modifying the HealthCheckMetrics implementation, and adjusting both the gRPC client health check and HTTP service behavior accordingly.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
telemetry-api/MetricsCreator.java	Updates metric description for health check gauge
telemetry-api/HealthCheckMetrics.java	Inverts gauge values to reflect healthy (1) and unhealthy (0)
query-graphql-plugin/query-protocol	Update subproject commit reference
library-client/GRPCClient.java	Adds health check scheduling and state handling
health-checker/HealthCheckerProvider.java	Adjusts health check score evaluation logic
health-checker/HealthCheckerHttpService.java	Updates HTTP service to return OK when score is 1
server-core/HealthStatus.java	Updates comment to reflect the new healthy score
docs/en/setup/backend/backend-health-check.md	Updates documentation to match the new health check semantics
docs/en/changes/changes.md	Logs the breaking change in health check response values

Comments suppressed due to low confidence (1)

oap-server/server-telemetry/telemetry-api/src/main/java/org/apache/skywalking/oap/server/telemetry/api/MetricsCreator.java:56

• The gauge description mentions a '-1 unknown' state which is not implemented in HealthCheckMetrics (only healthy (1) and unhealthy (0) are set). Consider updating the description to avoid confusion.

            Strings.lenientFormat("%s health check. 1 health, 0 not health, -1 unknown", name),