How to measure availability of a GraphQL endpoint?

[ChariotChai]

For general HTTP endpoints, we could usually calculate its availability by 2xx requests / total requests, or non-5xx-requests / total requests.

However GraphQL endpoints treat error as data and may include multiple data points in one single query. Is there a best practice to measure availability of that?

We are going to define a list of error codes which could be classified into 4xx-like and 5xx-like types. And if there is any 5xx-like error code in the error list of response, this request could be marked as a failure request. The availability could be calculated by non-failure requests / total requests. Does this make sense? Or any better idea?

[calvincestari]

This might be more applicable to the GraphQL over HTTP specification (response status codes) than GraphQL in general.