PromQL Query¶

Applying PromQL queries in charts can help you extract and analyze time series data from the Prometheus data source, and visually display the results in the chart.

Start Querying¶

1. Click "Add PromQL Query";
2. Select query method;
3. Begin querying.

Query Method¶

• Range Query: Runs the query over a specified time range
• Instant Query: Runs the query for a single point in time

For more details, refer to Comparison between DQL and other query languages; or go directly to PromQL.

Query Examples¶

For instance, if you want to monitor whether the concurrent limiter in a specific region has been triggered, so as to promptly identify potential performance issues or resource bottlenecks.

guancedb:guance_concurrent_limiter_current{region="#{region}"} > 0

Entering the above query statement means: filter out all data points where the value of the guance_concurrent_limiter_current Metrics is greater than 0, and the value of the region label for these data points is #{region}.

Assuming the value of region is us-west-1, the actual query statement will become:

guancedb:guance_concurrent_limiter_current{region="us-west-1"} > 0

This query will return all time series data where the region is us-west-1 and the value of the guance_concurrent_limiter_current Metrics is greater than 0.