diff --git a/prometheus-entrouvert-exporter/prometheus-entrouvert-exporter.py b/prometheus-entrouvert-exporter/prometheus-entrouvert-exporter.py
index bd2a754..33f8fdd 100755
--- a/prometheus-entrouvert-exporter/prometheus-entrouvert-exporter.py
+++ b/prometheus-entrouvert-exporter/prometheus-entrouvert-exporter.py
@@ -104,10 +104,15 @@ def local_changes(ctn):
 
 
 def munin(ctn):
-    f = "/var/log/munin/munin-node.log"
-    if os.path.isfile(f):
-        n = len([l for l in open(f).readlines() if "rror" in l and "mail_space" not in l])
-        eo_munin.labels(ctn, "errors").set(n)
+    since = datetime.datetime.now() - datetime.timedelta(hours=1)
+    since_str = since.strftime("%Y/%m/%d-%H:%M:%S")
+    count = 0
+    for filename in ["/var/log/munin/munin-node.log", "/var/log/munin/munin-node.log.1"]:
+        if os.path.isfile(filename):
+            count += len(
+                [x for x in open(filename).readlines() if x > since_str and "exited with status" in x]
+            )
+    eo_munin.labels(ctn, "errors").set(count)
 
 
 def nginx(ctn):