parshimers commented on code in PR #7172:
URL: https://github.com/apache/texera/pull/7172#discussion_r3692756926


##########
.github/workflows/runner-heartbeat.yml:
##########
@@ -0,0 +1,111 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+# Liveness probe for the self-hosted runner fleet. `beat` runs a trivial
+# job on the fleet every 15 minutes; a stale last-success means the fleet
+# is down. Two consumers act on that signal:
+#   - precheck.yml queries the last successful heartbeat directly (plain
+#     GITHUB_TOKEN) and falls back to GitHub-hosted runners for the build
+#     tiers when it is stale.
+#   - `watchdog` mirrors the verdict into the ARC_AVAILABLE repository
+#     variable, which the first-hop runs-on expressions (unable to call
+#     APIs) consult. The workflow GITHUB_TOKEN cannot write variables
+#     ("Resource not accessible by integration"), so watchdog uses
+#     AUTO_MERGE_TOKEN (collaborator suffices for the Variables API) and
+#     degrades to log-only when the secret is absent.
+name: Runner Heartbeat
+
+on:
+  schedule:
+    - cron: "*/15 * * * *"
+  workflow_dispatch:
+
+permissions:
+  actions: read
+
+concurrency:
+  group: runner-heartbeat
+  # A beat stuck queueing on a dead fleet is superseded by the next tick
+  # instead of piling up.
+  cancel-in-progress: true
+
+jobs:
+  beat:
+    runs-on: arc-light-linux

Review Comment:
   That's very interesting. Might it be worthwhile in this heartbeat job, to 
check other characteristics of the node health, e.g. free disk space, tool 
issues? Kind of the things Jenkins has for node health checks. Those things can 
cause cascading job failures despite the node being reachable. 



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