Every major cloud provider ships monitoring tools. AWS has CloudWatch. GCP has Cloud Monitoring. Azure has Azure Monitor. All three are deeply integrated with their respective platforms, and all three share the same fundamental limitation: they monitor from inside your cloud account.
That's not where your users are.
This guide explains where cloud-native monitoring falls short, how to structure external uptime monitoring for cloud workloads, and the specific setup steps for the patterns teams hit most often — Lambda functions, Cloud Functions, Cloud Run, and SSL-fronted cloud services.
Where Cloud-Native Monitoring Falls Short
Cloud providers build monitoring that answers questions from inside the cloud account:
- Is this Lambda function invoked? What's the error rate? What's the p99 duration?
- Is this Cloud Run instance scaling correctly? How many requests per second?
- Is this Azure App Service consuming more memory than expected?
These are useful questions. But none of them answer the question your users have: "Can I reach this service right now?"
The failure modes that cloud-native monitoring cannot detect:
1. Region-Specific Blind Spots
Cloud metrics are collected within a region. If a routing issue, DNS propagation failure, or edge network problem prevents users in one geography from reaching your service, your CloudWatch metrics may show perfectly normal values — because requests from that region simply never arrive.
CloudWatch doesn't know whether a user in São Paulo can reach your us-east-1 load balancer. It only knows what happens inside us-east-1 after a request arrives.
2. DNS and Domain Failures
When your Route 53 zone, your Cloud DNS records, or your Azure DNS zone has a configuration error, users get "server not found." Your application gets zero requests — so it logs zero errors. CloudWatch, Cloud Monitoring, and Azure Monitor all show clean dashboards.
External monitoring catches this immediately: it resolves your domain exactly as a user would, from multiple geographic locations, and fails immediately when DNS resolution fails.
3. SSL Certificate Expiry
Cloud providers offer managed certificates that auto-renew. But auto-renewal can fail — permission errors, domain validation failures, quota limits. When a managed certificate expires, users see browser security warnings and your application becomes unreachable.
CloudWatch doesn't track certificate expiry. Neither do Cloud Monitoring or Azure Monitor by default. External SSL certificate monitoring catches expiry before it becomes an outage.
4. CDN and Edge Failures
If you front your cloud services with CloudFront, Cloud CDN, or Azure CDN, an edge misconfiguration returns errors before requests reach your origin. Your origin application logs zero failed requests — because they never arrived. Your CloudWatch alarms for the origin remain green.
External monitoring checks the CDN-fronted URL — the one your users actually hit.
5. Cross-Cloud Dependency Failures
If your application depends on a third-party service, a cross-cloud API, or an external SaaS integration, failures there don't appear in your cloud monitoring. External uptime checks that verify your application's functional health (e.g., hitting an endpoint that exercises the dependency chain) catch these failures.
Setting Up Vigilmon for Cloud Workloads
Vigilmon provides external uptime monitoring with multi-region consensus alerting. Add a URL; Vigilmon checks it from multiple probe locations globally and alerts when multiple independent probes agree the endpoint is failing.
Monitoring AWS Lambda Functions
Lambda functions aren't directly addressable from the public internet — they're invoked via API Gateway, Function URLs, or Application Load Balancers.
Recommended approach: Monitor the API Gateway or Function URL endpoint that serves as the Lambda entry point.
- Create a health check endpoint in your Lambda function:
# Python Lambda handler
def handler(event, context):
path = event.get('path', '')
if path == '/health':
return {
'statusCode': 200,
'body': '{"status":"ok"}'
}
# ... rest of your function logic
- Ensure your API Gateway or Function URL exposes
/healthwith no auth required - In Vigilmon, add the full URL:
https://your-api-id.execute-api.us-east-1.amazonaws.com/prod/health - Set expected status: 200
- Add SSL monitoring for the same domain
What this catches: Lambda cold-start failures, function timeout issues, API Gateway misconfigurations, SSL expiry on your API Gateway custom domain, regional availability from external perspectives.
Monitoring Google Cloud Functions and Cloud Run
Cloud Functions and Cloud Run services are HTTP-triggered, which makes them straightforward to monitor externally.
For Cloud Functions:
// Node.js Cloud Function with health endpoint
const functions = require('@google-cloud/functions-framework');
functions.http('myFunction', (req, res) => {
if (req.path === '/health') {
res.status(200).json({ status: 'ok' });
return;
}
// ... rest of function logic
});
For Cloud Run:
Add a /health route to your Cloud Run service. Cloud Run already requires a health check for its own startup probes — expose the same endpoint externally.
In Vigilmon, monitor:
https://your-service-hash-uc.a.run.app/health— the Cloud Run default URLhttps://your-custom-domain.com/health— your custom domain (if configured)
Monitor both: the default Cloud Run URL bypasses your domain DNS, so monitoring it separately catches application-level failures independently of DNS issues.
SSL monitoring: Add your custom domain to Vigilmon's SSL checker. Cloud Run provisions managed certificates; alert if the certificate is within 14 days of expiry in case auto-renewal fails.
Monitoring Azure App Service and Azure Functions
Azure App Service provides a built-in health check endpoint at /health if you configure it under Settings → Health check in the Azure portal. This endpoint is also used by Azure's load balancer for routing decisions.
Expose the same endpoint externally and add it to Vigilmon:
https://your-app.azurewebsites.net/health— direct App Service URLhttps://your-custom-domain.com/health— custom domain (if configured)
For Azure Functions, expose an HTTP-triggered function at /api/health that returns 200 OK with no auth requirement, then monitor that URL.
SSL Certificate Monitoring for Cloud Endpoints
Cloud providers handle certificate provisioning for their managed domains (.execute-api, .run.app, .azurewebsites.net). But custom domains use certificates that can expire.
Add every custom domain serving production traffic to Vigilmon's SSL monitor:
https://api.yourcompany.com → Monitor HTTP + SSL
https://app.yourcompany.com → Monitor HTTP + SSL
https://status.yourcompany.com → Monitor HTTP + SSL
Vigilmon alerts 14 days before expiry by default — enough lead time to renew manually if auto-renewal fails before users see any impact.
Multi-Region Monitoring Configuration
One of the persistent gaps in cloud-native monitoring is regional bias. Your CloudWatch alarms run inside your AWS region. When you're running eu-west-1, your alarms reflect eu-west-1 behaviour.
Vigilmon's multi-region consensus addresses this: probes run from multiple independent geographic locations. A failure must be confirmed across multiple regions before an alert fires — which means transient single-region blips don't page your team, but genuine wide-area outages do.
For cloud services with global users, configure monitoring to validate:
- Primary public endpoint: Your main production URL
- Health check path: An endpoint that exercises core application functionality (database connectivity, cache warmth, etc.)
- SSL certificate: Your custom domain certificate
- API endpoints: High-traffic API paths that would expose failures in dependencies
Integrating Cloud Alerts with Vigilmon
Vigilmon's webhook alerts integrate directly with Slack, PagerDuty, and custom endpoints. For teams already using AWS SNS, Azure Alerting, or GCP Pub/Sub for internal alerts, Vigilmon's outbound webhooks can be routed to the same Slack channel or PagerDuty service — giving you a unified alert stream with external and internal signals differentiated by source.
Example Slack message from Vigilmon when an external probe fails:
🔴 [ALERT] api.yourcompany.com is DOWN
Confirmed from: eu-west-1, us-east-1, ap-southeast-1
Check type: HTTP / expected 200 / received connection timeout
SSL valid: yes (expires in 42 days)
Duration: ~2 minutes
This complements — not replaces — your CloudWatch/Cloud Monitoring alerts. The Vigilmon alert tells you the service is externally unreachable. Your internal cloud alerts tell you why (Lambda errors, CPU spike, database connection limit, etc.).
Summary: External Monitoring for Cloud Workloads
| Cloud Service | What to Monitor | External Monitoring Value |
|---|---|---|
| AWS Lambda + API Gateway | /health on the API Gateway URL | Catch API Gateway misconfigs, cold start loops, DNS failures |
| Google Cloud Functions | Function HTTP trigger URL | Catch function startup failures, routing issues |
| Google Cloud Run | Service URL + custom domain | Verify user-facing access independently of internal health |
| Azure App Service | App Service URL + custom domain | Catch external routing failures invisible to Azure Monitor |
| Azure Functions | HTTP trigger URL | Confirm public accessibility from outside Azure |
| Any custom domain | SSL certificate expiry | Alert before managed cert renewal failures hit production |
Cloud-native monitoring and external uptime monitoring are not competing approaches — they're complementary layers in a complete observability stack. Cloud-native tools see inside your account; external monitoring sees what your users see.
Start monitoring your cloud endpoints free at vigilmon.online — 5 monitors, 1-minute intervals, multi-region consensus, SSL monitoring, status page included.
Tags: #aws #gcp #azure #monitoring #devops #cloudnative #uptime