[Bug] Alerting: Alert results in NO DATA when Group By Terms Size is set to no limit.

[Filipe777]

What Grafana version are you using?

5.2.3

What datasource are you using?

Elasticsearch 6.4.0
Metricbeat 6.4.0

What OS are you running grafana on?

MacOS High Sierra

What did you do?

Created an alert for memory usage and tested rule.

What was the expected result?

What happened instead?

This happens only if the Group By Terms Size is set to No limit in the Metrics section. Once the Size is set to any decimal value, the alert works.

[marefr]

Code here needs to handle a size of 0 (zero) or a size of "0" (zero string) and set a size of 500 in that case.

Contributions are more than welcome!

[Filipe777]

Thank you for the feedback.

Regards.