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.
• Remove the dependency of refresh_interval of ElasticSearch indices from elasticsearch/flushInterval config. Now, it uses core/persistentPeriod + 5s as refresh_interval for all indices instead.
• Change elasticsearch/flushInterval to 5s(was 15s).
• Optimize flushInterval of ElasticSearch BulkProcessor to avoid extra periodical flush in the continuous bulk streams.
• An unexpected dot is added when exp is a pure metric name and expPrefix != null.
• Support monitoring MariaDB.
• Remove measure/stream specific interval settings in BanyanDB.
• Add global-specific settings used to override global configurations (e.g segmentIntervalDays, blockIntervalHours) in BanyanDB.
• Use TTL-driven interval settings for the measure-default group in BanyanDB.
• Fix wrong group of non time-relative metadata in BanyanDB.

UI

Documentation

• Remove Spring Sleuth docs, and add Spring MicroMeter Observations Analysis with the latest Java agent side enhancement.
• Update monitoring MySQL document to add the MariaDB part.

All issues and pull requests are here