v1.21.0

Note: This is the first release of Semantic Conventions separate from the Specification.

• Add GCP Bare Metal Solution as a cloud platform
  (#64)
• Clarify the scope of the HTTP client span.
  (#3290)
• Add moratorium on relying on schema transformations for telemetry stability
  (#3380)
• Mark "Instrumentation Units" and "Instrumentation Types" sections of the general
  metric semantic conventions as stable
  (#3294)
• Add clarification that UCUM c/s variant applies to all units other than 1 and
  those using annotations.
  (#3393)
• Specify that seconds should be used for measuring durations.
  (#3388)
• Change http.server.duration and http.client.duration units to seconds
  (#3390)
• BREAKING: Remove messaging.consumer.id, make messaging.client_id generic
  (#3336)
• Add transition plan for upcoming breaking changes to the unstable HTTP semantic
  conventions.
  (#3443)
• Rename net.peer.*, net.host.*, and net.sock.* attributes to align with ECS
  (#3402)
  BREAKING: rename net.peer.name to server.address on client side and to client.address on server side,
  net.peer.port to server.port on client side and to client.port on server side,
  net.host.name and net.host.port to server.address and server.port (since net.host.* attributes only applied to server instrumentation),
  net.sock.peer.addr to server.socket.address on client side and to client.socket.address on server side,
  net.sock.peer.port to server.socket.port on client side and to client.socket.port on server side,
  net.sock.peer.name to server.socket.domain (since net.sock.peer.name only applied to client instrumentation),
  net.sock.host.addr to server.socket.address (since net.sock.host.* only applied to server instrumentation),
  net.sock.host.port to server.socket.port (similarly since net.sock.host.* only applied to server instrumentation),
  http.client_ip to client.address
• BREAKING: Introduce network.transport defined as
  OSI Transport Layer or
  Inter-process Communication method.
  Introduce network.type defined as OSI Network Layer
  or non-OSI equivalent. Remove net.transport and net.sock.family.
  Rename net.protocol.* to network.protocol.*,
  net.host.connection.* to network.connection.*, and
  net.host.carrier.* to network.carrier.*.
  (#3426)
• BREAKING: Adopt ECS attributes in HTTP semantic conventions.
  Renames: http.method to http.request.method,
  http.status_code to http.response.status_code,
  http.request_content_length to http.request.body.size,
  http.response_content_length to http.response.body.size,
  http.url to url.full,
  http.scheme to url.scheme,
  and removes http.target breaking it down to http.target to url.path, url.query, and url.fragment.
  (#3355)
• Add gcp.cloud_run.job.execution and gcp.cloud_run.job.task_id resource
  attributes for GCP Cloud Run Jobs (#3378)
• Specify second unit (s) and advice bucket boundaries of []
  for process.runtime.jvm.gc.duration.
  (#3458)
• Specify the value range for JVM CPU metrics.
  (#13)
• Rename process.runtime.jvm.cpu.utilization to process.runtime.jvm.cpu.recent_utilization.
  (#53)
• Clarify process.runtime.jvm.threads.count refers to platform threads.
  (#54)
• Add gcp.gce.instance.name and gcp.gce.instance.hostname resource
  attributes for GCP Compute Engine VMs. (#15)
• Add note that HTTP duration metrics should match HTTP span duration.
  (#69)
• Clarify when HTTP client spans should end.
  (#70)
• Clarify that OTEL_SEMCONV_STABILITY_OPT_IN is a comma-separated list of values
  (#104)
• Add process.runtime.jvm.cpu.time metric.
  (#55)
• Split out sections for proposed stable JVM metrics and experimental JVM metrics.
  (#56)
• Make url.query conditionally required for HTTP spans.
  (#118)
• Change server.address and server.port requirement levels on HTTP server metrics
  from required to opt_in.
  (#109)
• Updated AWS Java Lambda guidance - using system properties.
  (#27)
• Limit http.request.method values to a closed set of known values,
  introduce http.request.method_original for the original value.
  (#17)
• Mark service.version as stable.
  (#106)
• Mark initial set of HTTP semantic conventions as frozen
  (#105)
• BREAKING: Remove messaging.source.* attributes and use messaging.destination.*
  attributes on producer and consumer to describe messaging queue or topic.
  (#100)
• Mark process.runtime.jvm.system.cpu.load_1m and process.runtime.jvm.system.cpu.utilization metrics as opt-in.
  (#57)
• Add container image.id, command, command_line and command_args resource attributes.
  (#39)
• Add Elasticsearch client semantic conventions.
  (#23)
• Add YAML definitions for log semantic conventions and define requirement levels
  (#133)
• Add markdown file for url semantic conventions
  (#174)