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GreptimeTeam / greptimedb

An open-source, cloud-native, unified time series database for metrics, logs and events with SQL/PromQL supported. Available on GreptimeCloud.
https://greptime.com/
Apache License 2.0
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fix: remove metric engine's internal column from promql's query #5032

Open waynexia opened 2 days ago

waynexia commented 2 days ago

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Filter out internal columns in promql's query. Those columns are valid for SQL query but PromQL requires them to be string.

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shuiyisong commented 1 day ago

https://github.com/GreptimeTeam/greptimedb/blob/c199604ece2060c0616bbf2ec182ca17f68f1cf6/src/servers/src/http/prometheus.rs#L695-L708

When listing metric names from the database, currently we don't have any filter, which means tables without greptime_timestamp and greptime_value will also be displayed. These tables do not fit Prometheus rules and will not generate any value in Grafana when queried using PromQL.

It would be better to filter out all tables without greptime_timestamp and greptime_value in this API in advance.