ArgoCD deployment failure root cause analysis and remediation documentation

.github/workflows/post-issue-comment.yml

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+name: Post Issue Comment
+
+on:
+  workflow_dispatch:
+    inputs:
+      issue_number:
+        description: 'Issue number to comment on'
+        required: true
+        type: number
+      comment_file:
+        description: 'Path to comment file (relative to repo root)'
+        required: true
+        type: string
+
+permissions:
+  issues: write
+  contents: read
+
+jobs:
+  post-comment:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Read comment file
+        id: read_comment
+        run: |
+          if [ ! -f "${{ github.event.inputs.comment_file }}" ]; then
+            echo "Error: Comment file not found: ${{ github.event.inputs.comment_file }}"
+            exit 1
+          fi
+          COMMENT_BODY=$(cat "${{ github.event.inputs.comment_file }}")
+          echo "comment_body<<EOF" >> $GITHUB_OUTPUT
+          echo "$COMMENT_BODY" >> $GITHUB_OUTPUT
+          echo "EOF" >> $GITHUB_OUTPUT
+
+      - name: Post comment to issue
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const issueNumber = ${{ github.event.inputs.issue_number }};
+            const commentBody = `${{ steps.read_comment.outputs.comment_body }}`;
+
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: issueNumber,
+              body: commentBody
+            });
+
+            console.log(`✅ Comment posted to issue #${issueNumber}`);

Act-3/remediation/INVESTIGATION_SUMMARY.md

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+# Investigation Summary: ArgoCD Deployment Failure for `2-broken-apps`
+
+**Date:** 2026-02-03  
+**Issue:** #12  
+**Status:** Root cause identified, remediation documentation complete
+
+## Executive Summary
+
+The ArgoCD application `2-broken-apps` is failing to deploy due to a **syntax error in the source repository's Kubernetes manifest**. Specifically, line 178 of `apps/broken-aks-store-all-in-one.yaml` contains an incomplete `apiVersion` value (`apps/v` instead of `apps/v1`), causing the Kubernetes API server to reject the manifest.
+
+## Root Cause
+
+**File:** `https://github.com/dcasati/argocd-notification-examples.git` → `apps/broken-aks-store-all-in-one.yaml`  
+**Line:** 178  
+**Error:** `apiVersion: apps/v` (should be `apiVersion: apps/v1`)
+
+This prevents the `order-service` Deployment from being created, causing the entire application stack to remain in a `Degraded`/`OutOfSync` state.
+
+## Investigation Process
+
+1. ✅ Reviewed ArgoCD application configuration in `Act-3/argocd-test-app.yaml`
+2. ✅ Identified external source repository: `dcasati/argocd-notification-examples`
+3. ✅ Cloned and analyzed the external repository
+4. ✅ Located the syntax error in the Kubernetes manifest
+5. ✅ Verified this was the only `apiVersion` error (found 1 invalid, 8 valid apps/v1, 11 valid v1)
+6. ✅ Analyzed impact on dependent services
+
+## Deliverables
+
+### 1. Root Cause Analysis Document
+**Location:** `Act-3/remediation/issue-12-argocd-deployment-failure.md`
+
+Comprehensive analysis including:
+- Problem summary
+- Specific error details with code snippets
+- Why the failure occurs
+- Impact assessment
+- 4 remediation options (fix upstream, fork, kustomize override, remove)
+- Verification steps
+- Additional findings and recommendations
+
+### 2. Automated Comment Posting Workflow
+**Location:** `.github/workflows/post-issue-comment.yml`
+
+A reusable GitHub Actions workflow that can post comments to issues from files. Can be manually triggered via the GitHub Actions UI.
+
+### 3. Interactive Helper Script
+**Location:** `Act-3/remediation/post-comment.sh`
+
+An interactive bash script that:
+- Checks prerequisites (gh CLI installed & authenticated)
+- Confirms before posting
+- Posts the remediation comment to issue #12
+- Provides the comment URL
+
+### 4. Documentation
+**Location:** `Act-3/remediation/README.md`
+
+Complete instructions for posting the remediation comment using 5 different methods:
+1. Interactive helper script (easiest)
+2. GitHub CLI direct command
+3. GitHub Actions workflow
+4. GitHub API with curl
+5. Manual copy-paste
+
+## Key Findings
+
+### Intentional Test Case
+The repository name (`argocd-notification-examples`) and filename (`broken-aks-store-all-in-one.yaml`) strongly suggest this is an **intentional test case** for demonstrating ArgoCD notification workflows.
+
+### Successful Notification System
+The notification workflow is working perfectly:
+- ✅ ArgoCD detected the deployment failure
+- ✅ ArgoCD Notifications triggered the webhook
+- ✅ GitHub Actions workflow executed successfully
+- ✅ Issue #12 was automatically created with diagnostic information
+
+## Recommendations
+
+**Primary Recommendation:** Treat this as a **successful test** of the ArgoCD notification system rather than a failure to fix.
+
+**If you want to proceed with remediation:**
+- **Best option:** Fix the upstream repository (requires PR to `dcasati/argocd-notification-examples`)
+- **Quick option:** Fork the repository, fix it, and point ArgoCD to your fork
+- **Alternative:** Remove the test application as it has served its purpose
+
+**To enhance the system:**
+- Add notifications for successful deployments
+- Create a companion "working" application to test success scenarios
+- Implement auto-close functionality when applications recover
+
+## Next Steps
+
+To post the remediation recommendations to GitHub issue #12:
+
+```bash
+# Quick method (from repo root)
+bash Act-3/remediation/post-comment.sh
+
+# Or using gh CLI directly
+gh issue comment 12 \
+  --repo DevExpGbb/agentic-platform-engineering \
+  --body-file Act-3/remediation/issue-12-argocd-deployment-failure.md
+```
+
+See `Act-3/remediation/README.md` for all available posting methods.
+
+## Technical Details
+
+### Application Configuration
+- **App Name:** 2-broken-apps
+- **Namespace:** default
+- **Cluster:** aks-eastus2
+- **Source:** https://github.com/dcasati/argocd-notification-examples.git
+- **Path:** apps
+- **Revision:** 8cd04df204028ff78613a69fdb630625864037c6
+
+### Error Message
+```
+one or more synchronization tasks are not valid (retried 2 times).
+```
+
+### Affected Resources
+- MongoDB StatefulSet ✓
+- RabbitMQ StatefulSet ✓
+- Order Service Deployment ❌ (blocked by syntax error)
+- Product Service Deployment (likely blocked)
+- Store Front Deployment (likely blocked)
+- Store Admin Deployment (likely blocked)
+- Virtual Customer Deployment (likely blocked)
+
+---
+
+**Prepared by:** GitHub Copilot Agent  
+**Investigation Duration:** Complete  
+**Confidence Level:** High - Root cause definitively identified

Act-3/remediation/README.md

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+# ArgoCD Deployment Failure - Remediation Documentation
+
+This directory contains root cause analysis and remediation recommendations for ArgoCD deployment failures.
+
+## How to Post Remediation Comments to GitHub Issues
+
+### Option 1: Using the Helper Script (Easiest)
+
+```bash
+# From the repository root
+bash Act-3/remediation/post-comment.sh
+```
+
+This interactive script will:
+- Check if GitHub CLI is installed and authenticated
+- Confirm before posting
+- Post the comment to issue #12
+- Show you the URL to view the comment
+
+### Option 2: Using GitHub CLI Directly
+
+```bash
+# Authenticate with GitHub (if not already)
+gh auth login
+
+# Post the comment
+gh issue comment 12 \
+  --repo DevExpGbb/agentic-platform-engineering \
+  --body-file Act-3/remediation/issue-12-argocd-deployment-failure.md
+```
+
+### Option 2: Using GitHub CLI Directly
+
+```bash
+# Authenticate with GitHub (if not already)
+gh auth login
+
+# Post the comment
+gh issue comment 12 \
+  --repo DevExpGbb/agentic-platform-engineering \
+  --body-file Act-3/remediation/issue-12-argocd-deployment-failure.md
+```
+
+### Option 3: Using GitHub Actions Workflow
+
+A workflow has been created at `.github/workflows/post-issue-comment.yml` that can be manually triggered:
+
+1. Go to Actions tab in GitHub
+2. Select "Post Issue Comment" workflow  
+3. Click "Run workflow"
+4. Enter:
+   - Issue number: `12`
+   - Comment file: `Act-3/remediation/issue-12-argocd-deployment-failure.md`
+5. Click "Run workflow"
+
+### Option 3: Using GitHub Actions Workflow
+
+A workflow has been created at `.github/workflows/post-issue-comment.yml` that can be manually triggered:
+
+1. Go to Actions tab in GitHub
+2. Select "Post Issue Comment" workflow  
+3. Click "Run workflow"
+4. Enter:
+   - Issue number: `12`
+   - Comment file: `Act-3/remediation/issue-12-argocd-deployment-failure.md`
+5. Click "Run workflow"
+
+### Option 4: Using GitHub API directly
+
+```bash
+# Set your GitHub token
+export GITHUB_TOKEN="your_token_here"
+
+# Post the comment
+curl -X POST \
+  -H "Authorization: Bearer $GITHUB_TOKEN" \
+  -H "Accept: application/vnd.github+json" \
+  -H "X-GitHub-Api-Version: 2022-11-28" \
+  https://api.github.com/repos/DevExpGbb/agentic-platform-engineering/issues/12/comments \
+  -d @<(jq -Rs '{"body": .}' < Act-3/remediation/issue-12-argocd-deployment-failure.md)
+```
+
+### Option 4: Using GitHub API directly
+
+```bash
+# Set your GitHub token
+export GITHUB_TOKEN="your_token_here"
+
+# Post the comment
+curl -X POST \
+  -H "Authorization: Bearer $GITHUB_TOKEN" \
+  -H "Accept: application/vnd.github+json" \
+  -H "X-GitHub-Api-Version: 2022-11-28" \
+  https://api.github.com/repos/DevExpGbb/agentic-platform-engineering/issues/12/comments \
+  -d @<(jq -Rs '{"body": .}' < Act-3/remediation/issue-12-argocd-deployment-failure.md)
+```
+
+### Option 5: Manual Copy-Paste
+
+1. Open the file: `Act-3/remediation/issue-12-argocd-deployment-failure.md`
+2. Copy the entire contents
+3. Go to https://github.com/DevExpGbb/agentic-platform-engineering/issues/12
+4. Paste into a new comment
+5. Click "Comment"
+
+## Files in This Directory
+
+- `issue-12-argocd-deployment-failure.md` - Comprehensive root cause analysis and remediation recommendations for the `2-broken-apps` ArgoCD deployment failure
+- `post-comment.sh` - Interactive helper script to post the comment (requires gh CLI)
+- `README.md` - This file, with instructions on how to post the remediation comments