prometheus: ignore benj/gmail errors

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

@@ -73,7 +73,9 @@ def etckeeper(ctn):
 def exim(ctn):
     with open('/var/log/exim4/mainlog', 'rb') as fh:
         for line in fh.readlines():
-            if b" ** " in line:
+            if b" ** " in line and not (
+                b'benjamin.dauvergne+eo@gmail.com' in line and b'support.google.com' in line
+            ):
                 eo_exim.labels(ctn, "errors").inc()
     deferred = int(run("exim -bpc"))
     eo_exim.labels(ctn, "deferred").set(deferred)