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10.4.0

Project

  • Introduce OAL V2 engine:

    • Immutable AST models for thread safety and predictable behavior
    • Type-safe enums replacing string-based filter operators
    • Precise error location reporting with file, line, and column numbers
    • Clean separation between parsing and code generation phases
    • Enhanced testability with models that can be constructed without parsing

  • Introduce MAL/LAL/Hierarchy V2 engine — replace Groovy-based DSL runtime with ANTLR4 parser + Javassist bytecode generation:

    • Remove Groovy runtime dependency from OAP backend
    • Fail-fast compilation at startup — syntax and type errors are caught immediately instead of at first execution
    • Thread-safe generated classes with no ThreadLocal or shared mutable state
    • Immutable AST models for all three DSLs (MAL, LAL, Hierarchy rules)
    • Explicit context passing replaces Groovy binding/closure capture
    • v1 (Groovy) and v2 (ANTLR4+Javassist) cross-version checker validates behavioral equivalence across 1,290+ expressions
    • JMH benchmarks confirm v2 runtime speedups: MAL execute ~6.8x, LAL compile ~39x / execute ~2.8x, Hierarchy execute ~2.6x faster than Groovy v1
    • Generated class names follow {yamlFileName}_L{lineNo}_{ruleName} pattern for all DSLs (MAL/LAL/Hierarchy) for stack trace traceability

  • Fix E2E test metrics verify: make it failure if the metric values all null.

  • Support building, testing, and publishing with Java 25.

  • Add CLAUDE.md as AI assistant guide for the project.

  • Upgrade Byte Buddy to 1.18.7 and configure explicit -javaagent for Mockito/Byte Buddy in Surefire to avoid JDK 25 dynamic agent loading warnings.

  • Upgrade Groovy to 5.0.3 in OAP backend.

  • Bump up nodejs to v24.13.0 for the latest UI(booster-ui) compiling.

  • Drop Elasticsearch 7.x (EOL) and OpenSearch 1.x from E2E tests, upgrade all ES tests to 8.18.8, and update skywalking-helm to use ECK 8.18.8.

  • Add library-batch-queue module — a partitioned, self-draining queue with type-based dispatch, adaptive partitioning, idle backoff, and throughput-weighted drain rebalancing (DrainBalancer). Designed to replace DataCarrier in high-fan-out scenarios.

  • Replace DataCarrier with BatchQueue for L1 metrics aggregation, L2 metrics persistence, TopN persistence, all three exporters (gRPC metrics, Kafka trace, Kafka log), and gRPC remote client. All metric types (OAL + MAL) now share unified queues instead of separate OAL/MAL pools. Each exporter keeps its own dedicated queue with 1 thread, preserving original buffer strategies. Thread count comparison on an 8-core machine (gRPC remote client excluded — unchanged 1 thread per peer):

    Queue Old threads Old channels Old buffer slots New threads New partitions New buffer slots New policy
    L1 Aggregation (OAL) 24 ~1,240 ~12.4M 8 (unified) ~330 adaptive ~6.6M cpuCores(1.0)
    L1 Aggregation (MAL) 2 ~100 ~100K (unified above)
    L2 Persistence (OAL) 2 ~620 ~1.24M 3 (unified) ~330 adaptive ~660K cpuCoresWithBase(1, 0.25)
    L2 Persistence (MAL) 1 ~100 ~100K (unified above)
    TopN Persistence 4 4 4K 1 4 adaptive 4K fixed(1)
    Exporters (gRPC/Kafka) 3 6 120K 3 (1 per exporter) — 60K fixed(1) each
    Total 36 ~2,070 ~13.9M 15 ~664 ~7.3M

  • Remove library-datacarrier-queue module. All usages have been replaced by library-batch-queue.

  • Enable throughput-weighted drain rebalancing for L1 aggregation and L2 persistence queues (10s interval). Periodically reassigns partitions across drain threads to equalize load when metric types have skewed throughput.

  • Add benchmark framework under benchmarks/ with Kind-based Kubernetes environments, automated thread dump collection and analysis. First case: thread-analysis on istio-cluster_oap-banyandb environment.

  • Add virtual thread support (JDK 25+) for gRPC and Armeria HTTP server handler threads. Set SW_VIRTUAL_THREADS_ENABLED=false to disable.

    Pool Threads (JDK < 25) Threads (JDK 25+)
    gRPC server handler (core-grpc, receiver-grpc, als-grpc, ebpf-grpc) Cached platform (unbounded) Virtual threads
    HTTP blocking (core-http, receiver-http, promql-http, logql-http, zipkin-query-http, zipkin-http, firehose-http) Cached platform (max 200) Virtual threads
    VT carrier threads (ForkJoinPool) N/A ~9 shared

    On JDK 25+, all 11 thread pools above share ~9 carrier threads instead of up to 1,400+ platform threads.

  • Change default Docker base image to JDK 25 (eclipse-temurin:25-jre). JDK 11 kept as -java11 variant.

  • Thread count benchmark comparison — 2-node OAP cluster on JDK 25 with BanyanDB, Istio bookinfo traffic (10-core machine, JVM-internal threads excluded):

    Pool v10.3.0 threads v10.4.0 threads Notes
    L1 Aggregation (OAL + MAL) 26 (DataCarrier) 10 (BatchQueue) Unified OAL + MAL
    L2 Persistence (OAL + MAL) 3 (DataCarrier) 4 (BatchQueue) Unified OAL + MAL
    TopN Persistence 4 (DataCarrier) 1 (BatchQueue)
    gRPC Remote Client 1 (DataCarrier) 1 (BatchQueue) Per peer
    Armeria HTTP event loop 20 5 min(5, cores) shared group
    Armeria HTTP handler on-demand platform(increasing with payload) - Virtual threads on JDK 25+
    gRPC event loop 10 10 Unchanged
    gRPC handler on-demand platform(increasing with payload) - Virtual threads on JDK 25+
    ForkJoinPool (Virtual Thread carrier) 0 ~10 JDK 25+ virtual thread scheduler
    HttpClient-SelectorManager 4 2 SharedKubernetesClient
    Schedulers + others ~24 ~24 Mostly unchanged
    Total (OAP threads) 150+ ~72 ~50% reduction, stable in high payload.

  • Replace PowerMock Whitebox with standard Java Reflection in server-library, server-core, and server-configuration to support JDK 25+.

  • Fix /debugging/config/dump may leak sensitive information if there are second level properties in the configuration.

OAP Server

  • KubernetesCoordinator: make self instance return real pod IP address instead of 127.0.0.1.

  • Enhance the alarm kernel with recovered status notification capability

  • Fix BrowserWebVitalsPerfData clsTime to cls and make it double type.

  • Init log-mal-rules at module provider start stage to avoid re-init for every LAL.

  • Fail fast if SampleFamily is empty after MAL filter expression.

  • Fix range matrix and scalar binary operation in PromQL.

  • Add LatestLabeledFunction for meter.

  • MAL Labeled metrics support additional attributes.

  • Bump up netty to 4.2.9.Final.

  • Add support for OpenSearch/ElasticSearch client certificate authentication.

  • Fix BanyanDB logs paging query.

  • Replace BanyanDB Java client with native implementation.

  • Remove bydb.dependencies.properties and set the compatible BanyanDB API version number in ${SW_STORAGE_BANYANDB_COMPATIBLE_SERVER_API_VERSIONS}.

  • Fix trace profiling query time range condition.

  • Add named ThreadFactory to all Executors.newXxx() calls to replace anonymous pool-N-thread-M thread names with meaningful names for easier thread dump analysis. Complete OAP server thread inventory (counts on an 8-core machine, exporters and JDBC are optional):

    Catalog Thread Name Count Policy Partitions
    Data Pipeline BatchQueue-METRICS_L1_AGGREGATION-N 8 cpuCores(1.0) ~330 adaptive
    Data Pipeline BatchQueue-METRICS_L2_PERSISTENCE-N 3 cpuCoresWithBase(1, 0.25) ~330 adaptive
    Data Pipeline BatchQueue-TOPN_PERSISTENCE-N 1 fixed(1) ~4 adaptive
    Data Pipeline BatchQueue-GRPC_REMOTE_{host}_{port}-N 1 per peer fixed(1) fixed(1)
    Data Pipeline BatchQueue-EXPORTER_GRPC_METRICS-N 1 fixed(1) fixed(1)
    Data Pipeline BatchQueue-EXPORTER_KAFKA_TRACE-N 1 fixed(1) fixed(1)
    Data Pipeline BatchQueue-EXPORTER_KAFKA_LOG-N 1 fixed(1) fixed(1)
    Data Pipeline BatchQueue-JDBC_ASYNC_BATCH_PERSISTENT-N 4 (configurable) fixed(N) fixed(N)
    Scheduler RemoteClientManager 1 scheduled —
    Scheduler PersistenceTimer 1 scheduled —
    Scheduler PersistenceTimer-prepare-N 2 (configurable) fixed pool —
    Scheduler DataTTLKeeper 1 scheduled —
    Scheduler CacheUpdateTimer 1 scheduled —
    Scheduler HierarchyAutoMatching 1 scheduled —
    Scheduler WatermarkWatcher 1 scheduled —
    Scheduler AlarmCore 1 scheduled —
    Scheduler HealthChecker 1 scheduled —
    Scheduler EndpointUriRecognition 1 (conditional) scheduled —
    Scheduler FileChangeMonitor 1 scheduled —
    Scheduler BanyanDB-ChannelManager 1 scheduled —
    Scheduler GRPCClient-HealthCheck-{host}:{port} 1 per client scheduled —
    Scheduler EBPFProfiling-N configurable fixed pool —

  • Fix BanyanDB time range overflow in profile thread snapshot query.

  • BrowserErrorLog, OAP Server generated UUID to replace the original client side ID, because Browser scripts can't guarantee generated IDs are globally unique.

  • MQE: fix multiple labeled metric query and ensure no results are returned if no label value combinations match.

  • Fix BrowserErrorLog BanyanDB storage query order.

  • BanyanDB Client: Property query support Order By.

  • MQE: trim the label values condition for the labeled metrics query to enhance the readability.

  • PromQL service: fix time parse issue when using RFC3339 time format for querying.

  • Envoy metrics service receiver: support adapter listener metrics.

  • Envoy metrics service receiver: support config MAL rules files.

  • Fix HttpAlarmCallback creating a new HttpClient on every alarm post() call, leaking NIO selector threads. Replace with a shared static singleton.

  • Add SharedKubernetesClient singleton in library-kubernetes-support to replace 9 separate KubernetesClientBuilder().build() calls across 7 files. Fixes KubernetesCoordinator client leak (never closed, NIO selector thread persisted). Uses KubernetesHttpClientFactory with virtual threads on JDK 25+ or a single fixed executor thread on JDK <25.

  • Reduce Armeria HTTP server event loop threads. All 7 HTTP servers now share one event loop group instead of each creating their own (Armeria default: cores * 2 per server = 140 on 10-core). Event loop: min(5, cores) shared — non-blocking I/O multiplexing needs few threads. Blocking executor: JDK 25+ uses virtual threads; JDK <25 keeps Armeria's default cached pool (up to 200 on-demand threads) because HTTP handlers block on long storage/DB queries.

  • Add the spring-ai components and the GenAI layer.

  • Bump up netty to 4.2.10.Final.

  • Bump up log4j to 2.25.3 and jackson to 2.18.5.

  • Remove PowerMock dependency. Replace Whitebox with ReflectUtil (standard Java reflection + sun.misc.Unsafe for final fields) across all modules to support JDK 25+.

  • Support TraceQL and Tempo API for Zipkin trace query.

  • Remove initExp from MAL configuration. It was an internal Groovy startup validation mechanism, not an end-user feature. The v2 ANTLR4 compiler performs fail-fast validation at startup natively.

  • Update hierarchy rule documentation: auto-matching-rules in hierarchy-definition.yml no longer use Groovy scripts. Rules now use a dedicated expression grammar supporting property access, String methods, if/else, comparisons, and logical operators. All shipped rules are fully compatible.

  • Activate otlp-traces handler in receiver-otel by default.

UI

  • Fix the missing icon in new native trace view.
  • Enhance the alert page to show the recovery time of resolved alerts.
  • Implement a common pagination component.
  • Fix validation guard for router.
  • Add the coldStage to the Duration for queries.
  • Optimize the pages theme.
  • Fix incorrect virtual service names.

Documentation

  • Add benchmark selection into banyanDB storage documentation.
  • Fix progressive TTL doc for banyanDB.
  • Restructure docs/README.md for better navigation with high-level documentation overview.
  • Move Marketplace as a top-level menu section with Overview introduction in menu.yml.
  • Polish marketplace.md as the overview page for all out-of-box monitoring features.
  • Add "What's Next" section to Quick Start docs guiding users to Marketplace.
  • Restructure agent compatibility page with OAP 10.x focus and clearer format for legacy versions.
  • Remove outdated FAQ docs (v3, v6 upgrade guides and 7.x metrics issue).
  • Remove "since 7/8/9.x" version statements from documentation as features are standard in 10.x.

All issues and pull requests are here