Function relayer_health_check_handler

pub async fn relayer_health_check_handler(
    job: Job<RelayerHealthCheck>,
    app_state: ThinData<DefaultAppState>,
    ctx: WorkerContext,
) -> Result<(), HandlerError>

Handler for relayer health check jobs.

This event-driven handler:

1. Checks if the relayer is disabled (exits early if not)
2. Runs stateless health checks on the disabled relayer
3. On success: Re-enables the relayer and sends a recovery notification
4. On failure: Updates the disabled reason (if changed) and schedules retry with exponential backoff

Behavior

• Early exit: If relayer is not disabled, exits without running checks
• Recovery notification: Unlike bootstrap (silent), sends notification when re-enabled
• Reason tracking: Updates disabled_reason if the failure reason changes between retries
• No redundant updates: Only updates reason when it actually changes

Arguments

• job - The job containing relayer health check data
• app_state - Application state with repositories and services
• ctx - Worker context with attempt number and task ID

Returns

Returns Ok(()) if the health check completes successfully, or an error otherwise.