Update PR performance benchmark pipeline (#133241)

Author: gbanasiak

.buildkite/pipelines/pull-request-performance-benchmark.yml

@@ -0,0 +1,3 @@
+steps:
+  - label: ":pipeline: Generate steps"
+    command: bash .buildkite/scripts/generate-pr-performance-benchmark.sh | buildkite-agent pipeline upload

.buildkite/pipelines/pull-request/performance-benchmark.yml

@@ -27,7 +27,8 @@
       "set_commit_status": false,
       "build_on_commit": false,
       "build_on_comment": true,
-      "trigger_comment_regex": "^(buildkite|@elastic(search)?machine) benchmark this with (?<benchmark>\\w+)( please)?$"
+      "target_branch": "main",
+      "trigger_comment_regex": "^(buildkite|@elastic(search)?machine) benchmark this with (?<benchmark>\\S+)( please)?$"
     }
   ]
 }

.buildkite/pull-requests.json

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+set -euo pipefail
+
+env_id_baseline=$(python3 -c 'import uuid; print(uuid.uuid4())')
+env_id_contender=$(python3 -c 'import uuid; print(uuid.uuid4())')
+merge_base=$(git merge-base "${GITHUB_PR_TARGET_BRANCH}" HEAD)
+
+buildkite-agent meta-data set pr_comment:custom-body:body \
+  "This build attempted two ${GITHUB_PR_COMMENT_VAR_BENCHMARK} benchmarks to evaluate performance impact of this PR."
+buildkite-agent meta-data set pr_comment:custom-baseline:head \
+  "* Baseline: ${merge_base} (env ID ${env_id_baseline})"
+buildkite-agent meta-data set pr_comment:custom-contender:head \
+  "* Contender: ${GITHUB_PR_TRIGGERED_SHA} (env ID ${env_id_contender})"
+
+cat << _EOF_
+steps:
+  - label: Trigger baseline benchmark
+    trigger: elasticsearch-performance-esbench-pr
+    build:
+      message: Baseline benchmark for PR${GITHUB_PR_NUMBER}
+      branch: master
+      env:
+        CONFIGURATION_NAME: ${GITHUB_PR_COMMENT_VAR_BENCHMARK}
+        ENV_ID: ${env_id_baseline}
+        REVISION: ${merge_base}
+  - label: Trigger contender benchmark
+    trigger: elasticsearch-performance-esbench-pr
+    build:
+      message: Contender benchmark for PR${GITHUB_PR_NUMBER}
+      branch: master
+      env:
+        CONFIGURATION_NAME: ${GITHUB_PR_COMMENT_VAR_BENCHMARK}
+        ENV_ID: ${env_id_contender}
+        ES_REPO_URL: https://github.com/${GITHUB_PR_OWNER}/${GITHUB_PR_REPO}.git
+        REVISION: ${GITHUB_PR_TRIGGERED_SHA}
+  - wait: ~
+  - label: Modify PR comment
+    command: buildkite-agent meta-data set pr_comment:custom-comparison:head "* [Benchmark results](<https://esbench-metrics.kb.us-east-2.aws.elastic-cloud.com:9243/app/dashboards#/view/d9079962-5866-49ef-b9f5-145f2141cd31?_a=(query:(language:kuery,query:'user-tags.env-id:${env_id_baseline} or user-tags.env-id:${env_id_contender}'))>)"
+_EOF_

.buildkite/scripts/generate-pr-performance-benchmark.sh

@@ -323,7 +323,7 @@ spec:
       name: elasticsearch / pull-request / performance-benchmark
     spec:
       repository: elastic/elasticsearch
-      pipeline_file: .buildkite/pipelines/pull-request/performance-benchmark.yml
+      pipeline_file: .buildkite/pipelines/pull-request-performance-benchmark.yml
       env:
         ELASTIC_PR_COMMENTS_ENABLED: "true"
         ELASTIC_SLACK_NOTIFICATIONS_ENABLED: "true"