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.
• Refactor StorageData#id to the new StorageID object from a String type.
• Support multiple component IDs in the service topology level.
• Add ElasticSearch.Keyword annotation to declare the target field type as keyword.
• [Breaking Change] Column component_id of service_relation_client_side and service_relation_server_side have been replaced by component_ids.
• Support priority definition in the component-libraries.yml.
• Enhance service topology query. When there are multiple components detected from the server side, the component type of the node would be determined by the priority, which was random in the previous release.
• Remove component_id from service_instance_relation_client_side and service_instance_relation_server_side.

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.
• Reorganize the protocols docs to a more clear API docs.

All issues and pull requests are here