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Previously
- `GetData` in the OpenTSDB client was returning empty `Metric{}` with
`nil` error for several conditions (multiple series returned, aggregate
tags present, `modifyData` failures), causing `vmctl opentsdb` to
silently drop series during migration
This commit changes these silent return paths to return proper errors with
descriptive messages including the query string, so operators can detect
and diagnose partial migrations.
Related PR https://github.com/VictoriaMetrics/VictoriaMetrics/pull/10797
See vmctl docs here.
vmctl docs can be edited at docs/vmctl.md.