Prometheus API Rules

# authorship: generated by API Evangelist tooling. Stamped 2026-08-18
# on the file's own generator header (roadmap#64). An unmarked file is
# NOT assumed to be ours -- absence of evidence was never stamped.
x-method: generated
# prometheus — AsyncAPI Spectral ruleset (strengthened)
# Plain Spectral. Rules measured from this provider's own AsyncAPI event
# conventions by strengthen_asyncapi.py, then self-validated against the spec.
#
# Provenance:
#   - server-secure-protocol: 100% of servers already secure
#   - payload-property-casing: camel @ 56% (n=27)
extends:
  - spectral:asyncapi
rules:
  server-secure-protocol:
    description: Servers should use a secure protocol (this API's convention).
    severity: error
    given: $.servers[*].protocol
    then:
      function: pattern
      functionOptions:
        match: ^(amqps|https|ibmmq|jms|kafka-secure|mqtts|secure-mqtt|stomps|wss)$
  payload-property-casing:
    description: Message payload properties should be camelCase (the dominant convention in this API).
    severity: info
    given: $.components.schemas[*].properties
    then:
      field: '@key'
      function: pattern
      functionOptions:
        match: ^[a-z][A-Za-z0-9]*$
  no-empty-descriptions:
    description: Descriptions must not be empty strings.
    severity: warn
    given: $..description
    then:
      function: truthy