scripts: add script to measure percentage of commits with failed status

.github/workflows/measure-test-flakiness.yaml

@@ -0,0 +1,15 @@
+name: Measure Test Flakiness
+
+on:
+  schedule:
+    - cron: "0 0 * * 0"
+
+jobs:
+  measure-test-flakiness:
+    name: Measure Test Flakiness
+    runs-on: ubuntu-latest
+    steps:
+      - name: Run script to measure test flakiness
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: "./scripts/measure-test-flakiness.sh"

scripts/measure-test-flakiness.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+set -e
+set -o pipefail
+
+if [[ -z ${GITHUB_TOKEN} ]]
+then
+    echo "Please set the \$GITHUB_TOKEN environment variable for the script to work"
+    exit 1
+fi
+
+temp_dir=$(mktemp -d)
+
+trap '{ rm -rf -- "${temp_dir}"; }' EXIT
+
+json_file="${temp_dir}/commit-and-check-data.json"
+
+curl --fail --show-error --silent -H "Authorization: token ${GITHUB_TOKEN}" \
+    -X POST \
+    -d '{
+        "query": "query { repository(owner: \"etcd-io\", name: \"etcd\") { defaultBranchRef { target { ... on Commit { history(first: 100) { edges { node { ... on Commit { commitUrl statusCheckRollup { state } } } } } } } } } }"
+    }' \
+    https://api.github.com/graphql | jq . > "${json_file}"
+
+failure_percentage=$(jq '.data.repository.defaultBranchRef.target.history.edges | reduce .[] as $item (0; if $item.node.statusCheckRollup.state == "FAILURE" then (. + 1) else . end)' "${json_file}")
+
+echo "Commit status failure percentage is - ${failure_percentage} %"