Add custom metrics to micrometer

[qligier]

No description provided.

[Copilot]

Pull request overview

This pull request adds custom metrics to Micrometer for monitoring Matchbox server operations. It introduces a new metrics infrastructure to track validation and transformation operations, along with a refactoring of the engine caching mechanism.

Changes:

• Introduces MatchboxMetrics class to expose validation count, validation duration, and transformation count metrics via Micrometer
• Refactors EngineSessionCache into MatchboxEngineCache with improved separation of permanent vs. transient engines
• Adds count() methods to ImplementationGuideProvider implementations to expose the number of installed IGs as a metric
• Updates CliContext to provide a sessionId() method for consistent session identification

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
matchbox-server/src/main/java/ch/ahdis/matchbox/util/metrics/MatchboxMetrics.java	New class that defines custom Micrometer metrics for validations and transformations
matchbox-server/src/main/java/ch/ahdis/matchbox/config/MatchboxMetricsConfig.java	New Spring configuration that registers metrics beans and exposes engine/IG counts
matchbox-server/src/main/java/ch/ahdis/matchbox/util/MatchboxEngineCache.java	New cache implementation replacing EngineSessionCache with better separation of permanent and transient engines
matchbox-server/src/main/java/ch/ahdis/matchbox/util/EngineSessionCache.java	Deleted file, replaced by MatchboxEngineCache
matchbox-server/src/main/java/ch/ahdis/matchbox/validation/ValidationProvider.java	Updated to collect validation metrics using MatchboxMetrics
matchbox-server/src/main/java/ch/ahdis/matchbox/validation/gazelle/GazelleValidationWs.java	Updated to collect validation metrics via constructor-injected MatchboxMetrics
matchbox-server/src/main/java/ch/ahdis/matchbox/mappinglanguage/StructureMapTransformProvider.java	Updated to collect transformation metrics using MatchboxMetrics
matchbox-server/src/main/java/ch/ahdis/matchbox/util/MatchboxEngineSupport.java	Refactored to use MatchboxEngineCache instead of EngineSessionCache, improving session ID handling
matchbox-server/src/main/java/ch/ahdis/matchbox/CliContext.java	Added sessionId() method to encapsulate session ID generation logic
matchbox-server/src/main/java/ch/ahdis/matchbox/packages/MatchboxImplementationGuideProvider.java	Added count() method interface for tracking installed IGs
matchbox-server/src/main/java/ch/ahdis/matchbox/packages/ImplementationGuideProviderR5.java	Implemented count() method to expose IG count metric
matchbox-server/src/main/java/ch/ahdis/matchbox/packages/ImplementationGuideProviderR4B.java	Implemented count() method to expose IG count metric
matchbox-server/src/main/java/ch/ahdis/matchbox/packages/ImplementationGuideProviderR4.java	Implemented count() method to expose IG count metric
matchbox-server/src/main/java/ch/ahdis/matchbox/config/MatchboxJpaConfig.java	Updated to create and inject MatchboxEngineCache bean
matchbox-server/src/main/java/ca/uhn/fhir/jpa/starter/Application.java	Added MatchboxMetricsConfig to Spring configuration imports

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[qligier]

Memory consumption seems to have increased, I need to investigate.