[7.x] [CI] Add error steps and help links to PR comments (#60772)

vars/githubPr.groovy

@@ -169,7 +169,20 @@ def getNextCommentMessage(previousCommentInfo = [:]) {
       ## :broken_heart: Build Failed
       * [continuous-integration/kibana-ci/pull-request](${env.BUILD_URL})
       * Commit: ${getCommitHash()}
+      * [Pipeline Steps](${env.BUILD_URL}flowGraphTable) (look for red circles / failed steps)
+      * [Interpreting CI Failures](https://www.elastic.co/guide/en/kibana/current/interpreting-ci-failures.html)
     """
+
+    try {
+      def steps = getFailedSteps()
+      if (steps?.size() > 0) {
+        def list = steps.collect { "* [${it.displayName}](${it.logs})" }.join("\n")
+        messages << "### Failed CI Steps\n${list}"
+      }
+    } catch (ex) {
+      buildUtils.printStacktrace(ex)
+      print "Error retrieving failed pipeline steps for PR comment, will skip this section"
+    }
   }
 
   messages << getTestFailuresMessage()
@@ -220,3 +233,9 @@ def deleteComment(commentId) {
 def getCommitHash() {
   return env.ghprbActualCommit
 }
+
+def getFailedSteps() {
+  return jenkinsApi.getFailedSteps()?.findAll { step ->
+    step.displayName != 'Check out from version control'
+  }
+}

vars/jenkinsApi.groovy

@@ -0,0 +1,21 @@
+def getSteps() {
+  def url = "${env.BUILD_URL}api/json?tree=actions[nodes[iconColor,running,displayName,id,parents]]"
+  def responseRaw = httpRequest([ method: "GET", url: url ])
+  def response = toJSON(responseRaw)
+
+  def graphAction = response?.actions?.find { it._class == "org.jenkinsci.plugins.workflow.job.views.FlowGraphAction" }
+
+  return graphAction?.nodes
+}
+
+def getFailedSteps() {
+  def steps = getSteps()
+  def failedSteps = steps?.findAll { it.iconColor == "red" && it._class == "org.jenkinsci.plugins.workflow.cps.nodes.StepAtomNode" }
+  failedSteps.each { step ->
+    step.logs = "${env.BUILD_URL}execution/node/${step.id}/log".toString()
+  }
+
+  return failedSteps
+}
+
+return this