stateDiagram-v2
    [*] --> HealthyStable : Normal Operations (100% Stable)

    HealthyStable --> RolloutInitiated : New Pod Template (Image Tag Bump)
    
    state RolloutInitiated {
        [*] --> CreatingCanaryRS
        CreatingCanaryRS --> AwaitingProbes : Pods Scheduled & Started
        AwaitingProbes --> CanaryReady : Readiness Probe Passed
    }

    RolloutInitiated --> Step1_Weight5 : Apply Step 1 (Weight = 5%)
    
    state Step1_Weight5 {
        [*] --> Timer120s_1
        Timer120s_1 --> Analyzing1 : Scrape Prometheus Every 30s
        Analyzing1 --> Step1_Passed : Error Rate < 0.5% & P99 < 250ms
    }

    Step1_Weight5 --> Step2_Weight25 : Step 1 Complete (Promote to 25%)
    
    state Step2_Weight25 {
        [*] --> Timer120s_2
        Timer120s_2 --> Analyzing2 : Scrape Prometheus Every 30s
        Analyzing2 --> Step2_Passed : Error Rate < 0.5% & P99 < 250ms
    }

    Step2_Weight25 --> Step3_Weight50 : Step 2 Complete (Promote to 50%)

    state Step3_Weight50 {
        [*] --> Timer120s_3
        Timer120s_3 --> Analyzing3 : Scrape Prometheus Every 30s
        Analyzing3 --> Step3_Passed : Parity Validated
    }

    Step3_Weight50 --> FullPromotion_Weight100 : Final Step Complete
    
    state FullPromotion_Weight100 {
        [*] --> CutoverTraffic : Set Weight = 100%
        CutoverTraffic --> DrainOldStable : Wait terminationGracePeriod (30s)
        DrainOldStable --> PromoteRS : Label Canary RS as New Stable
    }

    FullPromotion_Weight100 --> HealthyStable : Rollout Complete

    %% Error & Abort Transitions
    Step1_Weight5 --> Aborted : Analysis Failure OR Manual Abort
    Step2_Weight25 --> Aborted : Analysis Failure OR Manual Abort
    Step3_Weight50 --> Aborted : Analysis Failure OR Manual Abort

    state Aborted {
        [*] --> InstantTrafficZero : Reset TrafficSplit (Stable=100%, Canary=0%)
        InstantTrafficZero --> TerminateCanary : Scale Canary RS to 0 Replicas
        TerminateCanary --> PostIncidentAlert : Emit CloudEvent / Slack Alert
    }

    Aborted --> HealthyStable : Manual Retry or Rollback Spec