[BUG] Task Failure Alert for KPIs with Empty Sub-dimension List After Editing

[athul-osmo]

Describe the bug

The bug occurs when a KPI is edited and all existing sub-dimensions are completely removed so no sub-dimension is being ran for anomaly detection for a KPI.

Explain the environment

• Chaos Genius version: 0.6.1
• OS Version / Instance: macOS Big Sur 11.6.3
• Deployment type: setup from scratch

Current behavior

If a KPI is set up without sub-dimensions in the first place this error does not come up. However, after editing an existing KPI by removing all sub-dimensions, this task failure appears saying ValueError: No group keys passed! .

Expected behavior

When a KPI is edited to remove all sub-dimensions (in the case we do not want anomaly detection for sub-dimensions), it should allow us to give no keys for sub-dimensions without producing an error, or there should be an option to not run anomaly detection on sub-dimensions.

Screenshots

The task failure csv returned for one of the KPIs with this issue.

Additional context

We recreated the KPI from scratch without including any sub-dimensions and there were no task failures raised.

Logs

Provided in Expected Behavior section.

[manassolanki]

@varunp2k Can you please have a look at this issue?