chore: comment bench results on PR

Signed-off-by: Pranshu Srivastava <[email protected]>

.github/workflows/ci.yml

@@ -166,6 +166,27 @@ jobs:
       run: |
         make test-benchmark-compare
 
+  comment-ci-benchmark-tests:
+    name: comment-ci-benchmark-tests
+    runs-on: ubuntu-latest
+    needs: ci-benchmark-tests
+    steps:
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v4
+
+    - name: Comment benchmark results
+      uses: actions/github-script@v4
+      with:
+        script: |
+          const fs = require('fs');
+          const data = fs.readFileSync('benchstat.txt', 'utf8');
+          github.issues.createComment({
+            issue_number: context.issue.number,
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            body: data
+          });
+
   ci-build-kube-state-metrics:
     name: ci-build-kube-state-metrics
     runs-on: ubuntu-latest

.gitignore

@@ -41,5 +41,8 @@ _testmain.go
 # Generated CLI help file
 help.txt
 
+# Generated benchmark data
+benchstat.txt
+
 # jsonnet dependency management
 /scripts/vendor

tests/compare_benchmarks.sh

@@ -38,4 +38,12 @@ echo ""
 echo "### Result"
 echo "old=${REF_TO_COMPARE} new=${REF_CURRENT}"
 
-benchstat "${RESULT_TO_COMPARE}" "${RESULT_CURRENT}"
+BENCHSTAT_OUT=$(benchstat "${RESULT_TO_COMPARE}" "${RESULT_CURRENT}")
+
+# Display the result.
+cat <<EOF
+${BENCHSTAT_OUT}
+EOF
+
+# Append the result to the benchstat.txt file.
+echo "${BENCHSTAT_OUT}" >> "benchstat.txt"