Create a URL health check that runs on a schedule.
The check fetches the URL with the specified method and expects a status
code in the configured range (default 200-299). After N consecutive
failures (default 2), alerts fire to all configured destinations.
Checks auto-disable after continuous failure for --auto-disable-hours
(default 24) to avoid filling the database with identical failure rows.
Re-enable with strada checks enable <id>.
Alerts go to the same destinations as error alerts. If no destinations
are configured, add one first with strada alerts create.