diff --git a/docker/promtail/config.yaml b/docker/promtail/config.yaml
index 3b55a41eb..8f0380399 100644
--- a/docker/promtail/config.yaml
+++ b/docker/promtail/config.yaml
@@ -76,6 +76,12 @@ scrape_configs:
         target_label: "tier"
         replacement: "service"
 
+      # Default tier for anything unmatched
+      - source_labels: ["tier"]
+        regex: "^$"
+        target_label: "tier"
+        replacement: "other"
+
       # Drop monitoring container logs to save space (they're noisy)
       - source_labels: ["tier"]
         regex: "monitoring"