Dress4Win has configured a new uptime check with Google Stackdriver for several of their legacy services. The Stackdriver dashboard is not reporting the services as healthy. What should they do?
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Correct answer: In the Cloud Platform Console download the list of the uptime servers' IP addresses and create an inbound firewall rule.
Why this is the answer
The correct solution is to download the list of uptime servers' IP addresses and create an inbound firewall rule. Stackdriver Uptime Checks originate from specific Google-managed IP ranges. If these IP addresses are not allowed through the firewall of the legacy services, the checks will fail, and the services will appear unhealthy. Installing the Stackdriver agent is for collecting metrics and logs, not for enabling uptime checks to reach the service. Configuring the load balancer or web servers to pass or check the User-Agent header is irrelevant because the fundamental issue is network connectivity blocked by the firewall, preventing the requests from even reaching the load balancer or web server.
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