Added SIGNL4 as Alertmanager Webhook Receiver (#1777)
Added SIGNL4 as Alertmanager Webhook Receiver (#1777)

* Added SIGNL4 as Alertmanager Webhook Receiver

Signed-off-by: Ronald Czachara <b937b287f61b7a223d4aac55072db1a5381d3bb3@signl4.com>
Signed-off-by: rons4 <af8294ecae58aa24bb39dbe3d06de1e56a9121bc@de.derdack.com>
Co-authored-by: Ronald Czachara <b937b287f61b7a223d4aac55072db1a5381d3bb3@signl4.com>
prometheus/docs,prometheus/docs,prometheus/docs