Incident Management Flow: Mermaid Flowchart

Incident Management Flow flowchart diagram

About Source

An incident management flow is the structured process an engineering organization follows from the moment a production issue is detected through triage, mitigation, resolution, and post-incident review — minimizing the duration and customer impact of outages.

How the flow works

An incident is declared when an alert fires (see Alerting Workflow) or when a customer report indicates a production problem. The on-call engineer assesses severity and either resolves a minor issue independently or escalates by declaring a formal incident and paging an incident commander.

The incident commander is the coordinator: they maintain the incident timeline, coordinate communication between responders, provide status updates to stakeholders, and make decisions about escalation and remediation strategies. The commander does not investigate directly — they delegate technical investigation to subject matter experts.

The investigation phase uses observability tools to identify the root cause: correlating dashboard spikes, log search, and distributed traces to narrow down the failing component. Once a probable cause is identified, responders apply the fastest available mitigation — often a Rollback Deployment, a feature flag toggle, or a traffic reroute — to restore service before a permanent fix is ready.

Once the service is stable, the incident is declared resolved and a communications update is sent to affected customers. Within 24-72 hours, the team holds a post-incident review (blameless post-mortem). The review documents the timeline, identifies contributing factors, and produces action items — code fixes, monitoring improvements, runbook updates — that reduce the likelihood or impact of recurrence.

Frequently asked questions

An incident management flow is the structured process an engineering organisation follows from the moment a production issue is detected through triage, mitigation, resolution, and post-incident review — minimising the duration and customer impact of outages.

Triage begins with severity classification: the on-call engineer assesses how many users are affected, which systems are impacted, and whether the issue is spreading. A severity level (P1–P4) is assigned, which determines escalation path, communication cadence, and the size of the response team.

The incident commander coordinates the response without doing direct investigation. They maintain the incident timeline, delegate technical tasks to subject-matter experts, provide stakeholder updates at regular intervals, and make decisions about escalation — keeping the response structured so engineers can focus on diagnosis.

The most common mistakes are not declaring incidents early enough (letting minor issues escalate unchecked), neglecting the post-incident review (missing the opportunity to prevent recurrence), and writing post-mortems that assign blame (creating a culture where engineers hide problems rather than surfacing them).

mermaid

flowchart TD
    Detect[Incident detected via alert or customer report] --> Assess[On-call engineer assesses severity]
    Assess --> SevGate{High severity?}
    SevGate -->|No| SelfResolve[Engineer resolves minor issue]
    SevGate -->|Yes| DeclareIncident[Declare formal incident]
    DeclareIncident --> AssignIC[Assign incident commander]
    AssignIC --> NotifyResponders[Page subject matter experts]
    NotifyResponders --> Investigate[Investigate using metrics, logs, and traces]
    Investigate --> CauseFound{Root cause identified?}
    CauseFound -->|No| EscalateExperts[Escalate to additional experts]
    EscalateExperts --> Investigate
    CauseFound -->|Yes| Mitigate[Apply fastest mitigation]
    Mitigate --> ServiceStable{Service restored?}
    ServiceStable -->|No| Investigate
    ServiceStable -->|Yes| ResolveIncident[Declare incident resolved]
    ResolveIncident --> CustomerUpdate[Send customer status update]
    CustomerUpdate --> PostMortem[Conduct blameless post-mortem]
    PostMortem --> ActionItems[Create action items to prevent recurrence]