Various fixes for issue #8

[ph4n70m-nuk3r]

Partially fixes #8

[ph4n70m-nuk3r]

Also I don't have Go support in the non-commercial IDE I'm using, which is making this a pain to work on:

[ph4n70m-nuk3r]

Here, that is working, if you want to change the use of fmt.Printf(...) to use your own logger implementation, please feel free to do so.
I think the main priority here should be correct initialisation and shutdown of metrics when the app is not running in 'local' mode, and handling the case where no collectorURL is configured for the tracer outside of 'local' mode.

[ph4n70m-nuk3r]

I think I've addressed most of your concerns.

[ph4n70m-nuk3r]

I think that's now everything as you requested.

[bnkamalesh]

lgtm

[ph4n70m-nuk3r]

[ph4n70m-nuk3r]

I added this (used fmt to test in case logging subsystem was inactive at that point):

But after sending SIGTERM I didn't see the output.

Seems a bit fishy, but for the time being I suppose it can just be:

defer func() {
	_ := healthResp.Shutdown(ctx)
}()

[bnkamalesh]

lgtm