[8.x] ci(ftr): notify owners in the slack message when failures (#205260

) (#205717)

# Backport

This will backport the following commits from `main` to `8.x`:
- [ci(ftr): notify owners in the slack message when failures
(#205260)](#205260)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Victor
Martinez","email":"[email protected]"},"sourceCommit":{"committedDate":"2025-01-07T11:53:04Z","message":"ci(ftr):
notify owners in the slack message when failures
(#205260)","sha":"acc5e039baf1f36a46d6444ae79539c8ce05edc2","branchLabelMapping":{"^v9.0.0$":"main","^v8.18.0$":"8.x","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","v9.0.0","backport:all-open"],"title":"ci(ftr):
notify owners in the slack message when
failures","number":205260,"url":"https://github.com/elastic/kibana/pull/205260","mergeCommit":{"message":"ci(ftr):
notify owners in the slack message when failures
(#205260)","sha":"acc5e039baf1f36a46d6444ae79539c8ce05edc2"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v9.0.0","branchLabelMappingKey":"^v9.0.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/205260","number":205260,"mergeCommit":{"message":"ci(ftr):
notify owners in the slack message when failures
(#205260)","sha":"acc5e039baf1f36a46d6444ae79539c8ce05edc2"}}]}]
BACKPORT-->

Co-authored-by: Victor Martinez <[email protected]>

.buildkite/pipelines/on_merge_unsupported_ftrs.yml

@@ -37,6 +37,8 @@ steps:
       machineType: n2-standard-4
       preemptible: true
     depends_on: build
+    env:
+      PING_SLACK_TEAM: "@obs-ux-infra_services-team"
     timeout_in_minutes: 120
     retry:
       automatic:
@@ -54,6 +56,8 @@ steps:
       machineType: n2-standard-4
       preemptible: true
     depends_on: build
+    env:
+      PING_SLACK_TEAM: "@obs-ux-infra_services-team"
     timeout_in_minutes: 120
     retry:
       automatic:

.buildkite/scripts/lifecycle/post_command.sh

@@ -52,4 +52,12 @@ if [[ "$IS_TEST_EXECUTION_STEP" == "true" ]]; then
     buildkite-agent artifact upload 'target/test_failures/**/*'
     ts-node .buildkite/scripts/lifecycle/annotate_test_failures.ts
   fi
+
 fi
+
+if [[ $BUILDKITE_COMMAND_EXIT_STATUS -ne 0 ]]; then
+  # If the slack team environment variable is set, ping the team in slack
+  if [ -n "${PING_SLACK_TEAM:-}" ]; then
+    buildkite-agent meta-data set 'slack:ping_team:body' "${PING_SLACK_TEAM}, can you please take a look at the test failures?"
+  fi
+fi