prometheus: ignore dovecot lost LDAP connection errors

prometheus-entrouvert-exporter/prometheus-system-exporter.py

@@ -21,6 +21,13 @@ from prometheus_client.exposition import generate_latest
 from prometheus_client.parser import text_string_to_metric_families
 
 
+JOURNALD_IGNORED_ERRORS = {
+    'dovecot.service': [
+        'Connection lost to LDAP server, reconnecting',
+    ],
+}
+
+
 apt_cache = apt.Cache()
 registry = CollectorRegistry()
 eo_errors = Gauge("eo_errors", "failed tests", ["ctn"], registry=registry)
@@ -90,8 +97,15 @@ def journald(ctn):
     j.seek_realtime(fifteen)
     j.add_match(PRIORITY=3)
     for e in j:
-        eo_journal.labels(ctn, "error").inc()
         msg = e["MESSAGE"]
+        ignored_message = False
+        for ignored_string in JOURNALD_IGNORED_ERRORS.get(e.get('_SYSTEMD_UNIT')) or []:
+            if ignored_string in msg:
+                ignored_message = True
+                break
+        if ignored_message:
+            continue
+        eo_journal.labels(ctn, "error").inc()
         if "Connected -> NetworkFailure" in msg or "task nfsd" in msg:
             eo_journal.labels(ctn, "network_failure").inc()