You can't customise what the webhook sends <https://prometheus.io/docs/alerting/configuration/#webhook_config>, so you need to write a small proxy webserver which receives the webhook request, and re-POSTs a suitably modified upstream request.
Or use one of the existing integrations <https://prometheus.io/docs/operating/integrations/#alertmanager-webhook-receiver> if that's suitable. -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/c61e1227-5ba1-4b6c-b13e-4a34d16bd5b0%40googlegroups.com.
