Supervised GenServer that ensures the telemetry handler stays attached.

On init, attaches TelemetryHandler. Periodically checks that the handler is still registered with :telemetry and reattaches if missing.

Options

• :name — GenServer name (required)
• :handler_opts — options passed to TelemetryHandler.attach/1 (default: [])
• :interval — check interval in ms (default: 30_000)

Usage

# As part of a supervision tree:
children = [
  {HandlerGuardian, name: :my_guardian, interval: 30_000}
]