Service release FMEA

// Trace service release failures, from backward incompatibility to an alert blind spot, from cause to effect and mitigation; compare ordinal risk priorities without interpreting them as probabilities.
// Synthetic worked example: all entities, schedules and measurements are illustrative.
// Every string below is EXAMPLE text from a fictional model: replace it.
// Replace assumptions and inputs before applying this model to actual work.

fmea assessment {
  title: "Illustrative Service release FMEA"
  system: "Service release FMEA"
  team: "Cross-functional review"
  revision: "Workshop example"
}

failure_mode failure_0 {
  component: "Schema migration"
  mode: "Backward incompatibility"
  cause: "Old worker reads new schema"
  effect: "Requests fail during rollout"
  severity: 8
  occurrence: 3
  detection: 6
}

mitigation mitigation_0 {
  mode: failure_0
  action: "Use expand-contract migration"
  owner: "Assign accountable reviewer"
  target_severity: 8
  target_occurrence: 2
  target_detection: 3
}

failure_mode failure_1 {
  component: "Configuration"
  mode: "Wrong tenant scope"
  cause: "Environment mapping error"
  effect: "Data routed across workspaces"
  severity: 7
  occurrence: 4
  detection: 4
}

mitigation mitigation_1 {
  mode: failure_1
  action: "Validate scoped configuration before rollout"
  owner: "Assign accountable reviewer"
  target_severity: 7
  target_occurrence: 2
  target_detection: 3
}

failure_mode failure_2 {
  component: "Rollback"
  mode: "Irreversible state change"
  cause: "Rollback plan tests code only"
  effect: "Prior version cannot resume safely"
  severity: 6
  occurrence: 3
  detection: 5
}

mitigation mitigation_2 {
  mode: failure_2
  action: "Rehearse data-compatible rollback"
  owner: "Assign accountable reviewer"
  target_severity: 6
  target_occurrence: 2
  target_detection: 3
}

failure_mode failure_3 {
  component: "Monitoring"
  mode: "Alert blind spot"
  cause: "New failure metric not connected"
  effect: "Fault persists without detection"
  severity: 9
  occurrence: 2
  detection: 7
}

mitigation mitigation_3 {
  mode: failure_3
  action: "Test representative failure signals"
  owner: "Assign accountable reviewer"
  target_severity: 9
  target_occurrence: 2
  target_detection: 3
}

view priorities: fmea_table