feat: add Docker/cloud environment detection to telemetry (v2.18.1)

Added isDocker and cloudPlatform fields to session_start telemetry events to enable measurement of the v2.17.1 user ID stability fix.

Changes:
- Added detectCloudPlatform() method to event-tracker.ts
- Updated trackSessionStart() to include isDocker and cloudPlatform
- Added 16 comprehensive unit tests for environment detection
- Tests for all 8 cloud platforms (Railway, Render, Fly, Heroku, AWS, K8s, GCP, Azure)
- Tests for Docker detection, local env, and combined scenarios
- Version bumped to 2.18.1
- Comprehensive CHANGELOG entry

Impact:
- Enables validation of v2.17.1 boot_id-based user ID stability
- Allows segmentation of metrics by environment
- 100% backward compatible - only adds new fields
- All tests passing, TypeScript compilation successful

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

CHANGELOG.md

@@ -5,6 +5,117 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.18.1] - 2025-10-08
+
+### 🔍 Telemetry Enhancement
+
+**Added Docker/cloud environment detection to session_start events.**
+
+This release enables measurement of the v2.17.1 user ID stability fix by tracking which users are in Docker/cloud environments.
+
+#### Problem
+
+The v2.17.1 fix for Docker/cloud user ID stability (boot_id-based IDs) could not be validated because telemetry didn't capture Docker/cloud environment flags. Analysis showed:
+- Zero Docker/cloud users detected across all versions
+- No way to measure if the fix is working
+- Cannot determine what % of users are affected
+- Cannot validate stable user IDs are being generated
+
+#### Added
+
+- **Docker Detection**: `isDocker` boolean flag in session_start events
+  - Detects `IS_DOCKER=true` environment variable
+  - Identifies container deployments using boot_id-based stable IDs
+
+- **Cloud Platform Detection**: `cloudPlatform` string in session_start events
+  - Detects 8 cloud platforms: Railway, Render, Fly.io, Heroku, AWS, Kubernetes, GCP, Azure
+  - Identifies which platform users are deploying to
+  - Returns `null` for local/non-cloud environments
+
+- **New Detection Method**: `detectCloudPlatform()` in event tracker
+  - Checks platform-specific environment variables
+  - Returns platform name or null
+  - Uses same logic as config-manager's cloud detection
+
+#### Changed
+
+- `trackSessionStart()` in `src/telemetry/event-tracker.ts`
+  - Now includes `isDocker` field (boolean)
+  - Now includes `cloudPlatform` field (string | null)
+  - Backward compatible - only adds new fields
+
+#### Testing
+
+- 16 new unit tests for environment detection
+- Tests for Docker detection with IS_DOCKER flag
+- Tests for all 8 cloud platform detections
+- Tests for local environment (no flags)
+- Tests for combined Docker + cloud scenarios
+- 100% coverage for new detection logic
+
+#### Impact
+
+**Enables Future Analysis**:
+- Measure % of users in Docker/cloud vs local
+- Validate v2.17.1 boot_id-based user ID stability
+- Segment retention metrics by environment
+- Identify environment-specific issues
+- Calculate actual Docker user duplicate rate reduction
+
+**Expected Insights** (once data collected):
+- Actual % of Docker/cloud users in user base
+- Validation that boot_id method is being used
+- User ID stability improvements measurable
+- Environment-specific error patterns
+- Platform distribution of user base
+
+**No Breaking Changes**:
+- Only adds new fields to existing events
+- All existing code continues working
+- Event validator handles new fields automatically
+- 100% backward compatible
+
+#### Technical Details
+
+**Detection Logic**:
+```typescript
+isDocker: process.env.IS_DOCKER === 'true'
+cloudPlatform: detectCloudPlatform()  // Checks 8 env vars
+```
+
+**Platform Detection Priority**:
+1. Railway: `RAILWAY_ENVIRONMENT`
+2. Render: `RENDER`
+3. Fly.io: `FLY_APP_NAME`
+4. Heroku: `HEROKU_APP_NAME`
+5. AWS: `AWS_EXECUTION_ENV`
+6. Kubernetes: `KUBERNETES_SERVICE_HOST`
+7. GCP: `GOOGLE_CLOUD_PROJECT`
+8. Azure: `AZURE_FUNCTIONS_ENVIRONMENT`
+
+**Event Structure**:
+```json
+{
+  "event": "session_start",
+  "properties": {
+    "version": "2.18.1",
+    "platform": "linux",
+    "arch": "x64",
+    "nodeVersion": "v20.0.0",
+    "isDocker": true,
+    "cloudPlatform": "railway"
+  }
+}
+```
+
+#### Next Steps
+
+1. Deploy v2.18.1 to production
+2. Wait 24-48 hours for data collection
+3. Re-run telemetry analysis with environment segmentation
+4. Validate v2.17.1 boot_id fix effectiveness
+5. Calculate actual Docker user duplicate rate reduction
+
 ## [2.18.0] - 2025-10-08
 
 ### 🎯 Validation Warning System Redesign

package.json

@@ -1,6 +1,6 @@
 {
   "name": "n8n-mcp",
-  "version": "2.18.0",
+  "version": "2.18.1",
   "description": "Integration between n8n workflow automation and Model Context Protocol (MCP)",
   "main": "dist/index.js",
   "bin": {

package.runtime.json

@@ -1,6 +1,6 @@
 {
   "name": "n8n-mcp-runtime",
-  "version": "2.17.6",
+  "version": "2.18.1",
   "description": "n8n MCP Server Runtime Dependencies Only",
   "private": true,
   "dependencies": {

src/telemetry/event-tracker.ts

@@ -175,9 +175,27 @@ export class TelemetryEventTracker {
       platform: process.platform,
       arch: process.arch,
       nodeVersion: process.version,
+      isDocker: process.env.IS_DOCKER === 'true',
+      cloudPlatform: this.detectCloudPlatform(),
     });
   }
 
+  /**
+   * Detect cloud platform from environment variables
+   * Returns platform name or null if not in cloud
+   */
+  private detectCloudPlatform(): string | null {
+    if (process.env.RAILWAY_ENVIRONMENT) return 'railway';
+    if (process.env.RENDER) return 'render';
+    if (process.env.FLY_APP_NAME) return 'fly';
+    if (process.env.HEROKU_APP_NAME) return 'heroku';
+    if (process.env.AWS_EXECUTION_ENV) return 'aws';
+    if (process.env.KUBERNETES_SERVICE_HOST) return 'kubernetes';
+    if (process.env.GOOGLE_CLOUD_PROJECT) return 'gcp';
+    if (process.env.AZURE_FUNCTIONS_ENVIRONMENT) return 'azure';
+    return null;
+  }
+
   /**
    * Track search queries
    */

tests/unit/telemetry/event-tracker.test.ts

@@ -774,4 +774,197 @@ describe('TelemetryEventTracker', () => {
       expect(events[0].properties.context).toHaveLength(100);
     });
   });
+
+  describe('trackSessionStart()', () => {
+    // Store original env vars
+    const originalEnv = { ...process.env };
+
+    afterEach(() => {
+      // Restore original env vars after each test
+      process.env = { ...originalEnv };
+      eventTracker.clearEventQueue();
+    });
+
+    it('should track session start with basic environment info', () => {
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events).toHaveLength(1);
+      expect(events[0]).toMatchObject({
+        user_id: 'test-user-123',
+        event: 'session_start',
+      });
+
+      const props = events[0].properties;
+      expect(props.version).toBeDefined();
+      expect(typeof props.version).toBe('string');
+      expect(props.platform).toBeDefined();
+      expect(props.arch).toBeDefined();
+      expect(props.nodeVersion).toBeDefined();
+      expect(props.isDocker).toBe(false);
+      expect(props.cloudPlatform).toBeNull();
+    });
+
+    it('should detect Docker environment', () => {
+      process.env.IS_DOCKER = 'true';
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events[0].properties.isDocker).toBe(true);
+      expect(events[0].properties.cloudPlatform).toBeNull();
+    });
+
+    it('should detect Railway cloud platform', () => {
+      process.env.RAILWAY_ENVIRONMENT = 'production';
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events[0].properties.isDocker).toBe(false);
+      expect(events[0].properties.cloudPlatform).toBe('railway');
+    });
+
+    it('should detect Render cloud platform', () => {
+      process.env.RENDER = 'true';
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events[0].properties.isDocker).toBe(false);
+      expect(events[0].properties.cloudPlatform).toBe('render');
+    });
+
+    it('should detect Fly.io cloud platform', () => {
+      process.env.FLY_APP_NAME = 'my-app';
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events[0].properties.isDocker).toBe(false);
+      expect(events[0].properties.cloudPlatform).toBe('fly');
+    });
+
+    it('should detect Heroku cloud platform', () => {
+      process.env.HEROKU_APP_NAME = 'my-app';
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events[0].properties.isDocker).toBe(false);
+      expect(events[0].properties.cloudPlatform).toBe('heroku');
+    });
+
+    it('should detect AWS cloud platform', () => {
+      process.env.AWS_EXECUTION_ENV = 'AWS_ECS_FARGATE';
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events[0].properties.isDocker).toBe(false);
+      expect(events[0].properties.cloudPlatform).toBe('aws');
+    });
+
+    it('should detect Kubernetes cloud platform', () => {
+      process.env.KUBERNETES_SERVICE_HOST = '10.0.0.1';
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events[0].properties.isDocker).toBe(false);
+      expect(events[0].properties.cloudPlatform).toBe('kubernetes');
+    });
+
+    it('should detect GCP cloud platform', () => {
+      process.env.GOOGLE_CLOUD_PROJECT = 'my-project';
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events[0].properties.isDocker).toBe(false);
+      expect(events[0].properties.cloudPlatform).toBe('gcp');
+    });
+
+    it('should detect Azure cloud platform', () => {
+      process.env.AZURE_FUNCTIONS_ENVIRONMENT = 'Production';
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events[0].properties.isDocker).toBe(false);
+      expect(events[0].properties.cloudPlatform).toBe('azure');
+    });
+
+    it('should detect Docker + cloud platform combination', () => {
+      process.env.IS_DOCKER = 'true';
+      process.env.RAILWAY_ENVIRONMENT = 'production';
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events[0].properties.isDocker).toBe(true);
+      expect(events[0].properties.cloudPlatform).toBe('railway');
+    });
+
+    it('should handle local environment (no Docker, no cloud)', () => {
+      // Ensure no Docker or cloud env vars are set
+      delete process.env.IS_DOCKER;
+      delete process.env.RAILWAY_ENVIRONMENT;
+      delete process.env.RENDER;
+      delete process.env.FLY_APP_NAME;
+      delete process.env.HEROKU_APP_NAME;
+      delete process.env.AWS_EXECUTION_ENV;
+      delete process.env.KUBERNETES_SERVICE_HOST;
+      delete process.env.GOOGLE_CLOUD_PROJECT;
+      delete process.env.AZURE_FUNCTIONS_ENVIRONMENT;
+
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events[0].properties.isDocker).toBe(false);
+      expect(events[0].properties.cloudPlatform).toBeNull();
+    });
+
+    it('should prioritize Railway over other cloud platforms', () => {
+      // Set multiple cloud env vars - Railway should win (first in detection chain)
+      process.env.RAILWAY_ENVIRONMENT = 'production';
+      process.env.RENDER = 'true';
+      process.env.FLY_APP_NAME = 'my-app';
+
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events[0].properties.cloudPlatform).toBe('railway');
+    });
+
+    it('should not track when disabled', () => {
+      mockIsEnabled.mockReturnValue(false);
+      process.env.IS_DOCKER = 'true';
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events).toHaveLength(0);
+    });
+
+    it('should treat IS_DOCKER=false as not Docker', () => {
+      process.env.IS_DOCKER = 'false';
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      expect(events[0].properties.isDocker).toBe(false);
+    });
+
+    it('should include version, platform, arch, and nodeVersion', () => {
+      eventTracker.trackSessionStart();
+
+      const events = eventTracker.getEventQueue();
+      const props = events[0].properties;
+
+      // Check all expected fields are present
+      expect(props).toHaveProperty('version');
+      expect(props).toHaveProperty('platform');
+      expect(props).toHaveProperty('arch');
+      expect(props).toHaveProperty('nodeVersion');
+      expect(props).toHaveProperty('isDocker');
+      expect(props).toHaveProperty('cloudPlatform');
+
+      // Verify types
+      expect(typeof props.version).toBe('string');
+      expect(typeof props.platform).toBe('string');
+      expect(typeof props.arch).toBe('string');
+      expect(typeof props.nodeVersion).toBe('string');
+      expect(typeof props.isDocker).toBe('boolean');
+      expect(props.cloudPlatform === null || typeof props.cloudPlatform === 'string').toBe(true);
+    });
+  });
 });