Add a metrics middleware to app

[koddsson]

Fixes #245!

Collects metrics and makes 'em available on port 8091 under /metrics.

[MiniGod]

Nice!
I assume these metrics are reset after restarting the application?

[koddsson]

Oh, yeah. I didn't think of that 😁

[koddsson]

Maybe it's better to send 'em to a statsd server since the lib has support for that. I'll check if we can do that easily.

[kristjanmik]

It is probably better to did this in front of the application layer itself. I was taking a look at https://getkong.org the other day and it seems like the perfect fit for us. Then all this logging comes for free.

[koddsson]

@kristjanmik If we do something like kong, we'd just have to add it to our infrastructure?

[koddsson]

In any case should we merge this for now and then iterate on it? There's instant value to be had even if we lose the data once we restart the app and if it proves valuable we can go with either something like kong or start shipping the data to some server for safe keeping.

[koddsson]

Also kong looks really nice! 🐵

[kristjanmik]

I agree, I'm merging this in!

[MiniGod]

I assume the port is not exposed? Maybe we should just add it to the nginx config as a path?
I dislike loading pages on random ports. i.e. expose it on apis.is/metrics or something?

[koddsson]

Where does the nginx config live?

[kristjanmik]

@koddsson the nginx config is not shared. I aggree with @MiniGod we should query the port internally and expose it as an endpoint

[koddsson]

Jeee!

[koddsson]

Could you do that real quick? 🙏

[kristjanmik]

Sure

[koddsson]

You da 💣 !