v0.24.0 Release

• API changes:
  • Remove CONTEXT_SPAN_KEY and TAG_CONTEXT_KEY from API (#1938). This will be a breaking change to those who depend on these two keys, but anyone except gRPC shouldn't use it directly anyway.
• Bug fixes:
  • Count metrics should have unit '1'. (#1942)
  • Add deployment label for k8s resource. (#1943)
  • Removing AppEngine restriction on Java version. (#1944)
  • Use regular thread for to expose errors in appengine (#1955)
  • Clear handler reference on OcAgentTraceExporter unregister (#1965)
• Dependency updates.

v0.23.0 Release

• Make StackdriverStatsExporter.unregister() a public API.
• Add support spring plugin for http servlet and AsyncRestTemplate.

v0.22.1 Release

• Increase the buffer size for the trace export batch to 2500 (previously it was 32).

v0.22.0 Release

• Disable RunningSpanStore by default unless the z-pages contrib is linked and initialized. This may
  break behaviors for applications that rely on this to be always enabled.
• Provide a Deadline option to Stackdriver Trace exporter. Default value is 10 seconds if it's not set.
• Provide a Deadline option to Stackdriver Stats exporter. Default value is 10 seconds.
  Also provide a MetricServiceStub option so that advanced users can use a custom Stackdriver
  Monitoring client to make RPCs.
• Use Configuration builder pattern for creating JaegerTraceExporter, ZipkinTraceExporter and
  InstanaTraceExporter. Provide a Deadline option with default value 10 seconds.
• Provide a Deadline option to Datadog, Elasticsearch and OcAgent exporter. Default value is 10 seconds.
• Extract the common timeout logic of Trace exporters to opencensus-exporter-trace-util.

v0.21.0 Release

• Add HTTP text format serializer to Tag propagation component.
• Support constant labels in Gauge APIs.
• Add an option to allow users to override the default "opencensus_task" metric label in Stackdriver Stats Exporter.
• Allow setting custom namespace in Prometheus exporter.
• Add Cumulative (DoubleCumulative, LongCumulative, DerivedDoubleCumulative, DerivedLongCumulative) APIs.
• Add convenience APIs TagContextBuilder.putLocal() that adds non-propagating tags, and TagContextBuilder.putPropagating() that adds unlimited propagating tags.
• Deprecate context keys for tags and spans. Provide helper methods for interacting with context.

v0.20.0 Release

• Add OpenCensus Java OC-Agent Trace Exporter.
• Add OpenCensus Java OC-Agent Metrics Exporter.
• Add config option for Http-Servlet.
• Add config option for Jetty Http Client.
• Modified default value to false for publicEndpoint property in Http-Servlet.
• Add a generic AttachmentValue class to support Exemplar.
• Add Elasticsearch Trace Exporter.
• Add metrics.data package to hold common classes shared between stats and metrics.
• Refactor Exemplar and AttachmentValue to be under metrics.data. Note that this is a breaking change if you're using the Exemplar classes or APIs in the previous releases.
• Add TagMetadata that defines the properties associated with a Tag.
• Add QueueMetricProducer that supports pushing and buffering Metrics.

v0.19.2 Release

• Enable javadoc for jetty client

• Deprecated measures use instance of new measures when 1to1 mapping

• Clarify that realtime views are only for streaming rpcs

v0.19.1 Release

• Rollback scope creation for async request for HTTP Servlet plugin. The main reason is because the context can be leaked or set to unexpected values. See #1699 (comment)

V0.19.0 Release

• Add an artifact opencensus-contrib-http-jetty-client for instrumenting jetty http client. Add extractor for Jetty Client.
• Add an artifact opencensus-contrib-http-servlets for instrumenting http servlets. Add extractor for Http Servlets.
• Add support generic http server handler.
• Add support for generic http client handler.
• Add ability to filter metrics collected from Dropwizard registry.
• Add an util artifact opencensus-contrib-dropwizard5 to translate Dropwizard metrics5 to OpenCensus.
• Add metrics util package to be shared by all metrics exporters.
• Add Datadog Trace Exporter.

v0.18.0 Release

• Set the trace_sampled field
  in the Stackdriver LogEntry protocol buffer in opencensus-contrib-log-correlation-stackdriver.
• Add support for w3c/distributed-tracing propagation format.
• Add gRPC measures and views for real-time metrics in streaming RPCs.
• Add Summary Metric support for Stackdriver exporter.
• Reduce CPU usage for low qps applications.