groups:
  - id: rpc
    type: span
    brief: 'This document defines semantic conventions for remote procedure calls.'
    events: [rpc.message]
    attributes:
      - ref: rpc.system
        requirement_level: required
      - ref: rpc.service
        requirement_level: recommended
      - ref: rpc.method
        requirement_level: recommended
      - ref: network.transport
        requirement_level: recommended
      - ref: network.type
        requirement_level: recommended
      - ref: server.address
        requirement_level: required
        brief: >
          RPC server [host name](https://grpc.github.io/grpc/core/md_doc_naming.html).
        note: >
          May contain server IP address, DNS name, or local socket name. When host component is an IP address,
          instrumentations SHOULD NOT do a reverse proxy lookup to obtain DNS name and SHOULD set
          `server.address` to the IP address provided in the host component.
      - ref: server.port
        requirement_level:
          conditionally_required: if the port is supported by the network transport used for communication.

  - id: rpc.client
    type: span
    brief: 'This document defines semantic conventions for remote procedure call client spans.'
    extends: rpc
    attributes:
      - ref: network.peer.address
        requirement_level: recommended
      - ref: network.peer.port
        requirement_level:
          recommended: If `network.peer.address` is set.

  - id: rpc.server
    type: span
    extends: rpc
    span_kind: server
    brief: 'Semantic Convention for RPC server spans'
    attributes:
      - ref: client.address
        requirement_level: recommended
      - ref: client.port
        requirement_level: recommended
      - ref: network.peer.address
        requirement_level: recommended
      - ref: network.peer.port
        requirement_level:
          recommended: If `network.peer.address` is set.
      - ref: network.transport
        requirement_level: recommended
      - ref: network.type
        requirement_level: recommended

  - id: rpc.grpc
    type: span
    extends: rpc
    brief: 'Tech-specific attributes for gRPC.'
    attributes:
      - ref: rpc.grpc.status_code
        tag: grpc-tech-specific
        requirement_level: required
      - ref: rpc.grpc.request.metadata
        tag: grpc-tech-specific
        requirement_level: opt_in
      - ref: rpc.grpc.response.metadata
        tag: grpc-tech-specific
        requirement_level: opt_in

  - id: rpc.jsonrpc
    type: span
    extends: rpc
    brief: 'Tech-specific attributes for [JSON RPC](https://www.jsonrpc.org/).'
    attributes:
      - ref: rpc.jsonrpc.version
        tag: jsonrpc-tech-specific
        requirement_level:
          conditionally_required: If other than the default version (`1.0`)
      - ref: rpc.jsonrpc.request_id
        tag: jsonrpc-tech-specific
        requirement_level: recommended
      - ref: rpc.jsonrpc.error_code
        tag: jsonrpc-tech-specific
        requirement_level:
          conditionally_required: If response is not successful.
      - ref: rpc.jsonrpc.error_message
        tag: jsonrpc-tech-specific
        requirement_level: recommended
      - ref: rpc.method
        tag: jsonrpc-tech-specific
        requirement_level: required
        note: >
          This is always required for jsonrpc. See the note in the general
          RPC conventions for more information.

  - id: rpc.message
    type: event
    name: rpc.message
    brief: "RPC received/sent message."
    attributes:
      - ref: rpc.message.type
        requirement_level: recommended
      - ref: rpc.message.id
        requirement_level: recommended
      - ref: rpc.message.compressed_size
        requirement_level: recommended
      - ref: rpc.message.uncompressed_size
        requirement_level: recommended

  - id: rpc.connect_rpc
    type: span
    extends: rpc
    brief: 'Tech-specific attributes for Connect RPC.'
    attributes:
      - ref: rpc.connect_rpc.error_code
        tag: connect_rpc-tech-specific
        requirement_level:
          conditionally_required: If response is not successful and if error code available.
      - ref: rpc.connect_rpc.request.metadata
        tag: connect_rpc-tech-specific
        requirement_level: opt_in
      - ref: rpc.connect_rpc.response.metadata
        tag: connect_rpc-tech-specific
        requirement_level: opt_in