diff --git a/cookbooks/digdag/templates/etc/promtail/digdag.yaml b/cookbooks/digdag/templates/etc/promtail/digdag.yaml
index b78a19d..b201922 100644
--- a/cookbooks/digdag/templates/etc/promtail/digdag.yaml
+++ b/cookbooks/digdag/templates/etc/promtail/digdag.yaml
@@ -24,7 +24,11 @@ scrape_configs:
         action: drop
 
     - match:
-        selector: '{job="digdag"} |~ "^[0-9]+-[0-9]+-[0-9]+"'
+        selector: '{job="digdag"} |~ "^[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2} ERROR"'
+        action: drop
+
+    - match:
+        selector: '{job="digdag"} !~ "^[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2} ERROR"'
 
         stages:
         - regex: