The missing template rendering for Alertmanager webhook receivers.
The Prometheus developers are "not actively adding new receivers" for Alertmanager, and recommend implementing custom notification integrations via the webhook receiver. This project helps connecting Alertmanger with any webhook servers, in any format you want. The Delivery works between Alertmanager and downstream webhook servers, transforms messages from the Alertmanger as defined in the templates, and deliveries them to the downstream.
$ docker run -p 5678:5678 --rm hashicorp/http-echo -text="hello world"
$ go run main.go --config example/config.yaml
$ curl localhost:41357/echo-yaml -X POST -d @example/message.json
[TODO]
[TODO]