Replace LF with two spaces

Grafana v8.0.0 and newer (AlertingNG) changed the message format and sends a multi-line string.

contrib/modules/grafana.py

@@ -5,6 +5,7 @@ async def process(request):
 	obj = json.loads(await request.text())
 	evalMatchesStr = (': ' + ', '.join(f'{x["metric"]} = {x["value"]}' for x in obj['evalMatches'])) if 'evalMatches' in obj and obj['evalMatches'] else ''
 	if 'message' in obj:
-		return f'{obj["title"]} - {obj["message"]}{evalMatchesStr}'
+		message = obj['message'].replace('\n', '  ')
+		return f'{obj["title"]} - {message}{evalMatchesStr}'
 	else:
 		return f'{obj["title"]}{evalMatchesStr}'