OpenTelemetry tracing for the interLink API server #285
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Summary
Following the #272 PR, this one aims to implement a Otel tracing for the API server.
Since a function to set some spans' attributes was common, it has been moved to a new file called spans.go which is part of the interlink package, so any other applicative (for example plugins) can use it to set the duration of a monitored part of the code. This function supports Functional Options, so it can be easily expanded with more functionalities in the future. Right now, it supports WithHTTPReturnCode(code) as option, setting this HTTP status code as an attribute of the span; in the same way, more options will be possible to be passed to set more attributes using the same function.
Related issue :