Tools / Apache HertzBeat Interview Questions
How do you troubleshoot a monitor showing no data?
Work outward from the monitor itself toward the infrastructure around it, rather than guessing.
- Check the monitor's status in the UI — is it marked unreachable, and what error message is shown?
- Verify connectivity and credentials — can the collector actually reach the target's protocol port with the configured account?
- Check the assigned collector's health — is it online, and is this task actually assigned to it?
- Review the YML template's field mapping — a mismatched metric field name will silently return no values.
- Check the warehouse/TSDB connection — collected data with a broken storage backend won't persist for charts even if collection itself succeeded.
The first thing to check for a monitor showing no data is:
Collection can succeed but charts still stay empty if:
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