Work around Grafana's new alerting system not actually sending alerts (changes) but only alert statuses

contrib/modules/grafana.py

@@ -1,11 +1,30 @@
+import datetime
 import json
 
 
+FIVE_MINUTES = datetime.timedelta(seconds = 300)
+
+
+def parse_datetime(s):
+	assert s.endswith('Z')
+	if '.' in s:
+		s = s.split('.', 1)[0] + '+00:00'
+	else:
+		s = s[:-1] + '+00:00'
+	return datetime.datetime.fromisoformat(s)
+
+
 async def process(request):
+	now = datetime.datetime.now(datetime.timezone.utc)
 	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:
-		message = obj['message'].replace('\n', '  ')
-		return f'{obj["title"]} - {message}{evalMatchesStr}'
+	assert obj['version'] == '1'
+	alerts = []
+	for a in obj['alerts']:
+		startTime = parse_datetime(a['startsAt'])
+		endTime = parse_datetime(a['endsAt'])
+		if now - startTime < FIVE_MINUTES or now - endTime < FIVE_MINUTES:
+			alerts.append(f'{a["labels"]["alertname"]} {a["status"]}')
+	if alerts:
+		return f'[{obj["status"]}] {", ".join(alerts)}'
 	else:
-		return f'{obj["title"]}{evalMatchesStr}'
+		return f'[{obj["status"]}]'