How to send alert for every error in my logs using Promtail / Loki - AlertManager?

Grafana Configuration
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[How to send alert for every error in my logs using Promtail / Loki

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Please use this thread, it has some information.
https://localhost:3000/t/loki-send-alert-when-error-message-comes-in-log/42605?u=syedrumanaws