ci: add Slack message comparison to output-comparison job

- Add [SLACK_MESSAGE_START/END] markers in createSlackPoster for CI mode
- Capture full monitor output instead of sed filtering
- Extract and diff Slack messages separately from full output
- Set NODE_ENV=CI and --enableAlerting when running monitors

Author: douglance

.github/workflows/ci.yml

@@ -176,20 +176,17 @@ jobs:
         yarn workspace batch-poster-monitor build
         yarn workspace retryable-monitor build
 
-        # Run each monitor and extract summary output (from summary header to end)
+        # Run each monitor with --enableAlerting (NODE_ENV=CI outputs slack messages without posting)
         echo "=== ASSERTION MONITOR ===" > ../target-output.txt
-        timeout 180s yarn workspace assertion-monitor dev --configPath=../../config.ci.json 2>&1 | \
-          sed -n '/Assertion Monitor Alert Summary/,$p; /Monitoring complete/p' >> ../target-output.txt || true
+        NODE_ENV=CI timeout 300s yarn workspace assertion-monitor dev --configPath=../../config.ci.json --enableAlerting >> ../target-output.txt 2>&1 || true
 
         echo "" >> ../target-output.txt
         echo "=== BATCH POSTER MONITOR ===" >> ../target-output.txt
-        timeout 180s yarn workspace batch-poster-monitor dev --configPath=../../config.ci.json 2>&1 | \
-          sed -n '/Batch poster monitor summary/,$p' >> ../target-output.txt || true
+        NODE_ENV=CI timeout 300s yarn workspace batch-poster-monitor dev --configPath=../../config.ci.json --enableAlerting >> ../target-output.txt 2>&1 || true
 
         echo "" >> ../target-output.txt
         echo "=== RETRYABLE MONITOR ===" >> ../target-output.txt
-        timeout 180s yarn workspace retryable-monitor dev --configPath=../../config.ci.json 2>&1 | \
-          sed -n '/No retryables found/p; /retryables requiring action/,$p' >> ../target-output.txt || true
+        NODE_ENV=CI timeout 300s yarn workspace retryable-monitor dev --configPath=../../config.ci.json --enableAlerting >> ../target-output.txt 2>&1 || true
       continue-on-error: true
 
     - name: Run monitors on PR branch
@@ -202,20 +199,17 @@ jobs:
         yarn workspace batch-poster-monitor build
         yarn workspace retryable-monitor build
 
-        # Run each monitor and extract summary output (from summary header to end)
+        # Run each monitor with --enableAlerting (NODE_ENV=CI outputs slack messages without posting)
         echo "=== ASSERTION MONITOR ===" > ../pr-output.txt
-        timeout 180s yarn workspace assertion-monitor dev --configPath=../../config.ci.json 2>&1 | \
-          sed -n '/Assertion Monitor Alert Summary/,$p; /Monitoring complete/p' >> ../pr-output.txt || true
+        NODE_ENV=CI timeout 300s yarn workspace assertion-monitor dev --configPath=../../config.ci.json --enableAlerting >> ../pr-output.txt 2>&1 || true
 
         echo "" >> ../pr-output.txt
         echo "=== BATCH POSTER MONITOR ===" >> ../pr-output.txt
-        timeout 180s yarn workspace batch-poster-monitor dev --configPath=../../config.ci.json 2>&1 | \
-          sed -n '/Batch poster monitor summary/,$p' >> ../pr-output.txt || true
+        NODE_ENV=CI timeout 300s yarn workspace batch-poster-monitor dev --configPath=../../config.ci.json --enableAlerting >> ../pr-output.txt 2>&1 || true
 
         echo "" >> ../pr-output.txt
         echo "=== RETRYABLE MONITOR ===" >> ../pr-output.txt
-        timeout 180s yarn workspace retryable-monitor dev --configPath=../../config.ci.json 2>&1 | \
-          sed -n '/No retryables found/p; /retryables requiring action/,$p' >> ../pr-output.txt || true
+        NODE_ENV=CI timeout 300s yarn workspace retryable-monitor dev --configPath=../../config.ci.json --enableAlerting >> ../pr-output.txt 2>&1 || true
       continue-on-error: true
 
     - name: Show captured output
@@ -226,34 +220,74 @@ jobs:
         echo "=== PR BRANCH OUTPUT ==="
         cat pr-output.txt
 
+    - name: Extract Slack messages
+      run: |
+        # Extract content between [SLACK_MESSAGE_START] and [SLACK_MESSAGE_END] markers
+        extract_slack_messages() {
+          sed -n '/\[SLACK_MESSAGE_START\]/,/\[SLACK_MESSAGE_END\]/p' | grep -v '\[SLACK_MESSAGE_'
+        }
+
+        cat target-output.txt | extract_slack_messages > target-slack.txt || true
+        cat pr-output.txt | extract_slack_messages > pr-slack.txt || true
+
+        echo "=== TARGET SLACK MESSAGES ==="
+        cat target-slack.txt
+        echo ""
+        echo "=== PR SLACK MESSAGES ==="
+        cat pr-slack.txt
+
     - name: Normalize outputs and generate diff
       run: |
         # Normalize dynamic values (block numbers, addresses) for comparison
         normalize() {
           sed -E 's/[0-9]{7,}/BLOCK_NUM/g; s/[0-9]+n\b/BIGINT/g; s/0x[a-fA-F0-9]{40}/ADDR/g'
         }
 
+        # Normalize full output
         cat target-output.txt | normalize > target-normalized.txt
         cat pr-output.txt | normalize > pr-normalized.txt
 
-        # Generate unified diff (ignore exit code since diff returns 1 when files differ)
+        # Normalize slack messages
+        cat target-slack.txt | normalize > target-slack-normalized.txt
+        cat pr-slack.txt | normalize > pr-slack-normalized.txt
+
+        # Generate unified diffs (ignore exit code since diff returns 1 when files differ)
         diff -u target-normalized.txt pr-normalized.txt > output-diff.txt || true
+        diff -u target-slack-normalized.txt pr-slack-normalized.txt > slack-diff.txt || true
 
     - name: Post comment
       uses: actions/github-script@v7
       with:
         script: |
           const fs = require('fs');
 
-          const diffOutput = fs.existsSync('output-diff.txt')
+          const outputDiff = fs.existsSync('output-diff.txt')
             ? fs.readFileSync('output-diff.txt', 'utf8').trim()
             : '';
 
-          const hasChanges = diffOutput.length > 0;
+          const slackDiff = fs.existsSync('slack-diff.txt')
+            ? fs.readFileSync('slack-diff.txt', 'utf8').trim()
+            : '';
+
+          const hasOutputChanges = outputDiff.length > 0;
+          const hasSlackChanges = slackDiff.length > 0;
 
           let body = '';
-          if (hasChanges) {
-            body = '### ⚠️ Monitor Output Changes\n\n```diff\n' + diffOutput + '\n```';
+
+          if (hasOutputChanges || hasSlackChanges) {
+            body = '### ⚠️ Monitor Output Changes\n\n';
+
+            if (hasSlackChanges) {
+              body += '#### Slack Message Changes\n```diff\n' + slackDiff + '\n```\n\n';
+            } else {
+              body += '#### ✅ Slack Messages: No Changes\n\n';
+            }
+
+            if (hasOutputChanges) {
+              body += '<details>\n<summary>Full Output Changes</summary>\n\n```diff\n' + outputDiff + '\n```\n</details>';
+            } else {
+              body += '#### ✅ Full Output: No Changes';
+            }
           } else {
             body = '### ✅ Monitor Output: No Changes';
           }

packages/utils/createSlackPoster.ts

@@ -8,14 +8,23 @@ export const createSlackPoster = ({
   channelEnvVar: string
 }) => {
   return ({ message }: { message: string }) => {
+    // In CI mode, output the message with markers for extraction (skip actual posting)
+    if (process.env.NODE_ENV === 'CI') {
+      if (message !== 'success') {
+        console.log('[SLACK_MESSAGE_START]')
+        console.log(message)
+        console.log('[SLACK_MESSAGE_END]')
+      }
+      return
+    }
+
     const slackToken = process.env[tokenEnvVar]
     const slackChannel = process.env[channelEnvVar]
 
     if (!slackToken) throw new Error('Slack token is required.')
     if (!slackChannel) throw new Error('Slack channel is required.')
 
     if (process.env.NODE_ENV === 'DEV') return
-    if (process.env.NODE_ENV === 'CI' && message === 'success') return
 
     return postSlackMessage({
       slackToken,