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Hey @Kenichi Nakamura ! We support PromQL for alert expression.. Since we currently don't create any metrics related to captured exceptions, I suppose that won't be possible at the moment. Can you please raise an issue with feature request label in GitHub so that we can evaluate and prioritise the same?

hi @Prashant Shahi - sure I can do that, thanks 🙂

We generate the R.E.D metrics from traces received by signoz. You can make use of them if you are not already have custom counter metric. Added a comment with expression on issue.