• Add AttributeValueDouble to AttributeValue.
  • Add createWithSender to JaegerTraceExporter to allow use of HttpSender with extra configurations.
  • Add an API Functions.returnToString().
  • Migrate to new Stackdriver Kubernetes monitored resource. This could be a breaking change if you are using gke_container resources. For more info, https://cloud.google.com/monitoring/kubernetes-engine/migration#incompatible
  • Add OpenCensus Java OC-Agent Trace Exporter.

0.16.1 - 2018-09-18

  • Fix ClassCastException in Log4j log correlation (#1436).
  • Allow users to report metrics for their registered domain (using custom prefix). This could be a breaking change if you have custom prefix without (registered) domain.

0.16.0 - 2018-09-14

  • Add APIs to register gRPC client and server views separately.
  • Add an API MeasureMap.putAttachment() for recording exemplars.
  • Add Exemplar class and an API to get Exemplar list to DistributionData.
  • Improve the styling of Rpcz, Statsz, Tracez, and Traceconfigz pages.
  • Add an artifact opencensus-contrib-exemplar-util that has helper utilities on recording exemplars.
  • Reduce the default limit on Links per Span to 32 (was 128 before).
  • Add Spring support for @Traced annotation and java.sql.PreparedStatements tracing.
  • Allow custom prefix for Stackdriver metrics in StackdriverStatsConfiguration.
  • Add support to handle the Tracestate in the SpanContext.
  • Remove global synchronization from the get current stats state.
  • Add get/from{Byte} methods on TraceOptions and deprecate get/from{Bytes}.
  • Add an API to StackdriverTraceConfiguration to allow setting a TraceServiceStub instance to be used for export RPC calls.
  • Add an experimental artifact, opencensus-contrib-log-correlation-log4j2, for adding tracing data to Log4j 2 LogEvents.

0.15.1 - 2018-08-28

  • Improve propagation performance by avoiding doing string formatting when calling checkArgument.

0.15.0 - 2018-06-20

  • Expose the factory methods of MonitoredResource.
  • Add an experimental artifact, opencensus-contrib-log-correlation-stackdriver, for correlating traces and logs with Stackdriver Logging.

0.14.0 - 2018-06-04

  • Adds Tracing.getExportComponent().shutdown() for use within application shutdown hooks.
  • Duration.create now throws an IllegalArgumentException instead of returning a zero Duration when the arguments are invalid.
  • Timestamp.create now throws an IllegalArgumentException instead of returning a zero Timestamp when the arguments are invalid.
  • Remove namespace and help message prefix for Prometheus exporter. This could be a breaking change if you have Prometheus metrics from OpenCensus Prometheus exporter of previous versions, please point to the new metrics with no namespace instead.
  • Add an util artifact opencensus-contrib-appengine-standard-util to interact with the AppEngine CloudTraceContext.
  • Add support for Span kinds. (fix #1054).
  • Add client/server started_rpcs measures and views to RPC constants.

0.13.2 - 2018-05-08

  • Map http attributes to Stackdriver format (fix #1153).

0.13.1 - 2018-05-02

  • Fix a typo on displaying Aggregation Type for a View on StatsZ page.
  • Set bucket bounds as “le” labels for Prometheus Stats exporter.

0.13.0 - 2018-04-27

  • Support building with Java 9.
  • Add a QuickStart example.
  • Remove extraneous dependencies from the Agent's pom.xml.
  • Deprecate Window and WindowData.
  • Add a configuration class to the Prometheus stats exporter.
  • Fix build on platforms that are not supported by netty-tcnative.
  • Add Jaeger trace exporter.
  • Add a gRPC Hello World example.
  • Remove usages of Guava collections in opencensus-api.
  • Set unit “1” when the aggregation type is Count.
  • Auto detect GCE and GKE Stackdriver MonitoredResources.
  • Make Error Prone and FindBugs annotations compileOnly dependencies.
  • Deprecate Mean and MeanData.
  • Sort TagKeys in View.create(...).
  • Add utility class to expose default HTTP measures, tags and view, and register default views.
  • Add new RPC measure and view constants, deprecate old ones.
  • Makes the trace and span ID fields mandatory in binary format.
  • Auto detect AWS EC2 resources.
  • Add Duration.toMillis().
  • Make monitored resource utils a separate artifact opencensus-contrib-monitored-resource-util, so that it can be reused across exporters.
  • Add LastValue, LastValueDouble and LastValueLong. Also support them in stats exporters and zpages. Please note that there is an API breaking change in methods Aggregation.match() and AggregationData.match().

0.12.3 - 2018-04-13

  • Substitute non-ascii characters in B3Format header key.

0.12.2 - 2018-02-26

  • Upgrade disruptor to include the fix for SleepingWaitStrategy causing 100% CPU.

0.12.1 - 2018-02-26

  • Fix performance issue where unused objects were referenced by the Disruptor.
  • Fix synchonization issue in the use of the Disruptor.

0.12.0 - 2018-02-16

  • Rename trace exporters that have inconsistent naming. Exporters with legacy names are deprecated.
  • Fixed bug in CloudTraceFormat that made it impossible to use short span id's.
  • Add since Javadoc tag to all APIs.
  • Add a configuration class to create StackdriverTraceExporter.
  • Add MessageEvent and deprecate NetworkEvent.
  • Instana Trace Exporter.
  • Prometheus Stats Exporter.
  • Stats Zpages: RpcZ and StatsZ.
  • Dependency updates.

0.11.1 - 2018-01-23

  • Fixed bug that made it impossible to use short span id's (#950).

0.11.0 - 2018-01-19

  • Add TextFormat API and two implementations (B3Format and CloudTraceFormat).
  • Add helper class to configure and create StackdriverStatsExporter.
  • Add helper methods in tracer to wrap Runnable and Callbacks and to run them.
  • Increase trace exporting interval to 5s.
  • Add helper class to register views.
  • Make stackdriver stats exporter compatible with GAE Java7.
  • Add SignalFX stats exporter.
  • Add http propagation APIs.
  • Dependency updates.

0.10.0 - 2017-12-04

  • Add NoopRunningSpanStore and NoopSampledSpanStore.
  • Change the message event to include (un)compressed sizes for Tracez Zpage.
  • Use AppEngine compatible way to create threads.
  • Add new factory methods that support setting custom Stackdriver MonitoredResource for Stackdriver Stats Exporter.
  • Dependency updates.

0.9.1 - 2017-11-29

  • Fix several implementation bugs in Stackdriver Stats Exporter (#830, #831, etc.).
  • Update length limit for View.Name to 255 (previously it's 256).

0.9.0 - 2017-11-17

  • Initial stats and tagging implementation for Java (impl) and Android (impl-lite). This implements all the stats and tagging APIs since v0.8.0.
  • Deprecate Tags.setState and Stats.setState.
  • Add a setStatus method in the Span.
  • OpenCensus Stackdriver Stats Exporter.
  • OpenCensus Stackdriver Trace Exporter is updated to use Stackdriver Trace V2 APIs.
  • Dependency updates.