Excessibility.TelemetryCapture.Analyzers.MessageFlooding (Excessibility v0.18.1)

Detects high-frequency handle_info message patterns.

LiveViews subscribing to PubSub or using timers can receive messages faster than useful, causing unnecessary processing and renders.

Opt-in

This analyzer reads handle_info:* timeline events. Phoenix LiveView emits no handle_info telemetry, so those events are only captured when you opt into the Excessibility.TelemetryCapture on_mount hook (issue #147) — e.g. live_session :default, on_mount: [Excessibility.TelemetryCapture]. Because that wiring is opt-in, the analyzer is not in the default set (a default-on analyzer with no hook would imply coverage while staying silent). Enable it explicitly (--analyze=message_flooding or via config) once the hook is wired.

Detection

Sliding window: >10 same-name handle_info events within 200ms
Total count: >20 of any single handle_info type
Suggests debouncing, throttling, or increasing timer intervals

Output

%{
  findings: [%{
    severity: :warning,
    message: "47 handle_info(:tick) events in 200ms...",
    events: [1, 2, ..., 47],
    metadata: %{event_type: "handle_info:tick", count: 47, window_ms: 200}
  }],
  stats: %{handle_info_counts: %{"handle_info:tick" => 47}}
}