netdata/health/guides/httpcheck/httpcheck_web_service_bad_content.md

Understand the alert

The Netdata Agent monitors your HTTP endpoints. You can specify endpoints that the agent will monitor in Agent's Go module under go.d/httpcheck.conf. You can also specify the expected response pattern. This HTTP endpoint will send in the response_match option. If the endpoint's response does not match the response_match pattern, then the Agent marks the response as unexpected.

The Netdata Agent calculates the average ratio of HTTP responses with unexpected content over the last 5 minutes.

This alert is escalated to warning if the percentage of unexpected content is greater than 10% and then raised to critical if it is greater than 40%.

Troubleshoot the alert

Check the actual response and the expected response.

1. Try to implement a request with a verbose result:

   curl -v <your_http_endpoint>:<port>/<path>
   

2. Compare it with the expected response.

Check your configuration under go.d/httpcheck.conf:

cd /etc/netdata # Replace this path with your Netdata config directory
sudo ./edit-config go.d/httpcheck.conf

Useful resources

1. HTTP endpoint monitoring with Netdata