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What a cron health check tells you
A heartbeat monitor waits for your scheduled task to contact it. Healthchecks.io describes the pattern as a cron job sending an HTTP request, or “ping,” each time it completes (Healthchecks.io documentation). Create a separate check for each job so each can have its own schedule and notification settings.
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A missed ping can point to a powered-off host, a stopped or misconfigured cron daemon, a task that failed before reaching its final command, or a task that is taking unusually long. It confirms that a signal arrived; it does not prove that a backup is restorable or that an import produced correct data. Pair the heartbeat with application-level validation or restore tests when output correctness matters. Healthchecks.io also distinguishes this use from website uptime monitoring: a cron heartbeat is not an external probe of a site.
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Set up the check
- Create a check for the job. In your chosen heartbeat service, create one check per scheduled task and copy its unique ping URL. Treat that URL as sensitive: do not publish it in documentation or public repositories.
- Configure the schedule and grace period. Enter the expected interval or cron expression, the server’s time zone, and a grace period. Healthchecks.io’s configuration uses all three. Set grace long enough to accommodate ordinary runtime and reasonable scheduling variation, but not so long that a genuine outage goes unnoticed. For a cron expression, make sure the configured time zone matches the machine’s time zone; a mismatch can make runs appear early or late.
- Add a success-only ping. Put the HTTP request after the task and gate it on a successful exit status. For example, Healthchecks.io documents this shell pattern for a daily backup:
8 6 * * * /home/me/backup.sh && curl -fsS -m 10 --retry 5 -o /dev/null https://hc-ping.com/your-uuid-hereReplace the example path and placeholder URL with values for your own system; never use a real ping URL in a public example. In this command, && means curl runs only if /home/me/backup.sh exits with status zero. The curl flags make unsuccessful HTTP responses return an error, limit the request to 10 seconds, retry up to five times, suppress the response body, and keep normal output quiet while retaining errors. Adapt timeout and retry behavior to the job. Another HTTP client can send the request as well.
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Decide whether a failure to deliver the heartbeat should affect the cron command’s exit status. The example surfaces a curl error, but no single policy fits every workload. For important jobs, arrange local logging or alerting if the ping itself cannot be delivered; otherwise, a network problem could prevent the monitor from receiving the signal.
Choose useful signals and alerts
Success, start, and failure signals
The minimum useful signal is a success ping after work finishes. Some services also accept a start signal and an explicit failure signal. Healthchecks.io documents /start and /fail signal paths; Better Stack also documents a /fail endpoint. A start/success pair can help the service measure runtime, while an explicit failure signal can distinguish a known task error from a job that never checked in. Configure these behaviors according to the service’s documentation.
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Healthchecks.io can classify request bodies using configured keywords, which can make diagnostic output more useful. Avoid sending secrets or sensitive data in a request body.
Notification routes
Choose notification channels based on the consequences of a missed run. Healthchecks.io documents email, webhooks, SMS, chat, and incident-management integrations. Its setup guide recommends multiple notification paths for important jobs; use a route that someone will act on, and add a redundant route where the job is critical. Better Stack offers heartbeat monitoring as part of a broader incident and on-call workflow.
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Test the whole path
- Run the task successfully in the environment where cron will execute it. Confirm the check records a heartbeat and that the expected notification configuration is active.
- Simulate a missed run or use a test check. Confirm it transitions to an alert only after the configured grace period, and verify that the alert reaches the intended recipients.
- If using start or failure signals, exercise those paths too. Confirm that a failed task does not also send an unconditional success ping.
Testing the monitoring path catches errors that a correctly formatted cron line alone will not: wrong URLs, mismatched time zones, insufficient notification configuration, or a ping that runs even when the task fails.
When email or broader monitoring is a better fit
Cron’s MAILTO setting can send job output by email, but it requires a configured mail transfer agent. It can also become noisy when a task writes output, and it does not provide the same independent signal about a host or network outage. A heartbeat monitor is more suitable when the key question is whether a periodic job checked in on schedule.
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Heartbeat checks are not a replacement for website uptime probes, application performance monitoring, or log aggregation. Choose a tool that matches the failure you need to detect.
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Choose a monitoring service by fit
A focused heartbeat service can keep per-job checks and schedule configuration straightforward. A broader incident platform may fit better when missed jobs need to enter an existing incident or on-call process. Compare the operational details that affect your environment:
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- Support for your schedule syntax and time-zone behavior.
- Handling of start, success, explicit failure, and diagnostic output.
- Notification channels, escalation workflow, and redundancy.
- Check limits and current plan terms, which may change.
- Whether you need a focused hosted service, a broader incident workflow, or self-hosted software.
As of its product page accessed in 2026, Healthchecks.io advertises “Monitor 20 cron jobs for free. No credit card required.” This is the vendor’s plan claim, not an independent statistic; confirm current limits and terms on the Healthchecks.io product page before relying on it. Better Stack documents heartbeat frequency, grace periods, incidents, and on-call escalation in its heartbeat monitoring documentation.
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