skywalking/docs/en/changes/changes.md

9.4.0

Project

OAP Server

• Add ServerStatusService in the core module to provide a new way to expose booting status to other modules.
• Adds Micrometer as a new component.(ID=141)
• Refactor session cache in MetricsPersistentWorker.
• Cache enhancement - don't read new metrics from database in minute dimensionality.

    // When
    // (1) the time bucket of the server's latest stability status is provided
    //     1.1 the OAP has booted successfully
    //     1.2 the current dimensionality is in minute.
    // (2) the metrics are from the time after the timeOfLatestStabilitySts
    // (3) the metrics don't exist in the cache
    // the kernel should NOT try to load it from the database.
    //
    // Notice, about condition (2),
    // for the specific minute of booted successfully, the metrics are expected to load from database when
    // it doesn't exist in the cache.

• Remove the offset of metric session timeout according to worker creation sequence.
• Correct MetricsExtension annotations declarations in manual entities.
• Support component IDs' priority in process relation metrics.
• Remove abandon logic in MergableBufferedData, which caused unexpected no-update.
• Fix miss set LastUpdateTimestamp that caused the metrics session to expire.
• Rename MAL rule spring-sleuth.yaml to spring-micrometer.yaml.
• Fix memory leak in Zipkin API.

UI

Documentation

• Remove Spring Sleuth docs, and add Spring MicroMeter Observations Analysis with the latest Java agent side enhancement.

All issues and pull requests are here