Collects and aggregates telemetry events for the dashboard.

The Collector is a GenServer that:

1. Attaches to PropertyDamage telemetry events
2. Aggregates metrics (counts, timings, pass/fail rates)
3. Maintains a sliding window of recent events
4. Broadcasts updates to subscribers (LiveView processes)

Usage

# Start the collector (typically in your application supervisor)
{:ok, pid} = PropertyDamage.Telemetry.Collector.start_link()

# Subscribe to updates (from a LiveView)
PropertyDamage.Telemetry.Collector.subscribe()

# Get current state
state = PropertyDamage.Telemetry.Collector.get_state()

State Structure

The collector maintains:

• runs - Total runs started
• runs_completed - Successful runs
• runs_failed - Failed runs
• commands_executed - Total commands executed
• checks_passed - Total checks passed
• checks_failed - Total checks failed
• current_run - Current run info (if running)
• recent_events - Last N events (sliding window)
• command_stats - Per-command timing stats
• check_stats - Per-check pass/fail stats