v1.39.0

🛑 Breaking changes 🛑

• rpc: Rename rpc.client|server.duration to rpc.client|server.call.duration, change RPC duration metrics from milliseconds to seconds, and clarify metric and span duration semantics for streaming. (#383, #2961)
• rpc: Rename rpc.grpc.request.metadata and rpc.connect_rpc.request.metadata to rpc.request.metadata
• rpc.grpc.response.metadata and rpc.connect_rpc.response.metadata to rpc.response.metadata
  (#2869, #3169)
• rpc: Merge rpc.method and rpc.service into fully-qualified rpc.method attribute. Clarify how to handle possible high cardinality of rpc.method in edge cases. Clarify rpc.method usage in span names. (#2863, #3196, #3223)
• rpc: Deprecate rpc.grpc.status_code, rpc.connect_rpc.error_code and rpc.jsonrpc.error_code attributes in favor of the more general rpc.response.status_code attribute.
  (#1504, #2920)
• rpc: Align RPC conventions with naming guidelines. Renames:
  • rpc.system to rpc.system.name. The values are also updated to match
    naming guidelines: connect_rpc is renamed to connectrpc;
    apache_dubbo is renamed to dubbo;
    java_rmi, dotnet_wcf, and onc_rpc are not included in the new enum.
  • rpc.jsonrpc.request_id to jsonrpc.request.id.
  • rpc.jsonrpc.version to jsonrpc.protocol.version.
    (#2703, #2921)
• system, linux: Rename *.linux.memory metrics and attributes to *.memory.linux (#1661)

🚩 Deprecations 🚩

• peer: The peer.service attribute has been deprecated in favor of service.peer.name. (#2945)
  The peer.service attribute has been renamed to service.peer.name to align with the service.{name|namespace} resource attributes.
• process: Introduce process.unix.file_descriptor.count and process.windows.handle.count metrics.
  Deprecate process.open_file_descriptor.count
  (#3188)

💡 Enhancements 💡

• cloud: Add gcp.agent_engine as a value for cloud.platform (#2957)

• cloud: Add Oracle Cloud Infrastructure to SemConv Areas list (#3190)

• cloud: Add Hetzner Cloud to cloud.provider and cloud.platform (#2758)

• cloud: Add Linode (Akamai Cloud) to cloud.provider and linode_cloud_compute to cloud.platform (#2756)

• cloud: Add Vultr Cloud to cloud.provider and cloud.platform (#2757)

• k8s: Add missing entity associations to k8s and container metrics (#3213)

• k8s: Adds k8s.pod.ip, k8s.pod.hostname and k8s.pod.start_time attributes (#3171)

• k8s: Define missing roles for entity attributes (#3135)

• k8s: Promote a selection of k8s and container attributes to alpha (#3120)
  The selected attributes being promoted are used by the Collector Contrib components
  that are targeting stability. See opentelemetry-collector-contrib/#44130

• k8s: Define roles for k8s entities' attributes (#3017)

• mcp: Add MCP semantic conventions (#2043, #2083)

• otel: Add otel.event.name attribute for use by non-OTLP exporters and logging libraries. (#2913)
  The otel.event.name attribute can be used by:

  • Non-OTLP exporters to emit the EventName
  • Applications using existing logging libraries to add event name information that can be used to set the EventName field by Collector or SDK components

• pprof: add various pprof attributes to support lossless conversion from and to OTel profiles. (#3078)

• rpc: Use consistent set of attributes between RPC spans and metrics (#2922, #3197)

  • Use rpc.response.status_code on common metrics and spans.
  • Make error.type note consistent between metrics and spans.
  • Promote notes on rpc.method and rpc.service to attribute definition.

• rpc: Mark rpc.system.name, rpc.method, rpc.service, server.address, and server.port as sampling relevant attributes in RPC spans.
  (#3202)

• service: Splits service into three entities: namespace, service and instance. (#2880)

• service: service.peer.name and service.peer.namespace have been introduced as the replacement for peer.service to describe remote services that use both a name and a namespace. (#2945)
  The peer.service attribute could not fully represent the service.{name|namespace} resource attributes;
  service.peer.name and service.peer.namespace provide a more complete representation.

🧰 Bug fixes 🧰

• rpc: Demote server.address from required to conditionally required (when available) on RPC spans and metrics. Update server.port requirement level accordingly. (#3236)

New Contributors

• @paulojmdias made their first contribution in #2756
• @codeboten made their first contribution in #3164
• @marleypowell made their first contribution in #3166
• @mmanciop made their first contribution in #3097

Full Changelog: v1.38.0...v1.39.0