chore: fix devnet alert regex (#20538)

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Author: alexghr

spartan/metrics/values.tmp.yaml

@@ -125,7 +125,7 @@ grafana:
     NEXT_NET_REGEX: "next-net"
     TESTNET_NAMESPACES_REGEX: "testnet|v[0-9]+-testnet"
     MAINNET_NAMESPACES_REGEX: "mainnet|v[0-9]+-mainnet|ignition"
-    DEVNET_NAMESPACES_REGEX: "devnet"
+    DEVNET_NAMESPACES_REGEX: ".*devnet.*"
     SLACK_WEBHOOK_URL: "http://127.0.0.1" # dummy value
     SLACK_WEBHOOK_STAGING_PUBLIC_URL: "http://127.0.0.1" # dummy value
     SLACK_WEBHOOK_STAGING_IGNITION_URL: "http://127.0.0.1" # dummy value