SigNoz is an open-source APM. It helps developers monitor their applications & troubleshoot problems, an open-source alternative to DataDog, NewRelic, etc.

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<@U03EWS8GW77> The expression here may be what you need - <https://github.com/SigNoz/signoz.io/issues/404#issue-1293935258>

image.png

<@U01HPVB0D2S> from the below screen shot, if the operation POST/api/process/start duration goes beyond 300 ms, in that case i need alert and email notification for the same.

<@U03EWS8GW77> I just added an example for alerting an endpoint/operation. The alert can be configured from <https://github.com/SigNoz/signoz.io/issues/404#issuecomment-1175851619>

We do not support email as channel in alerts yet. You can use webhook  to send it to another service that can send an email.

<@U01HWQ1RTC2> Getting something wrong error while setting up the alert. histogram_quantile(0.99, sum(rate(signoz_latency_bucket{service_name="workflow-service", operation="/api/process/start"}[5m])) by (le)) &gt; 200 -- this is the query

Screenshot 2022-07-06 at 1.54.08 PM.png

<@U03EWS8GW77> you just need to replace the `expr` field key with the above query..rest of the field keys are mandatory though you should change the value of keys like `alert` name, `severity` , `summary` etc with relevant text

I would keep it something like below

```alert: High Latency of operation ProcessStart
expr: histogram_quantile(0.99, sum(rate(signoz_latency_bucket{service_name="workflow-service", operation="/api/process/start"}[5m])) by (le)) &gt; 200 
for: 0m
labels:
    severity: critical
annotations:
    summary: High Latency of operation ProcessStart in Workflow Service
    description: "Latency is &gt; 200
        VALUE = {{ $value }}
        LABELS = {{ $labels }}"
    ```
