metrics middleware broken

[dsvensson]

I suspect it's bad to use gramework.BytesToString here:

https://github.com/gramework/gramework/blob/dev/metrics/metrics.go#L95

It causes errors like this in the /metrics endpoint:

* collected metric "gramework_http_requests_total" { label:<name:"code" value:"200" > label:
<name:"method" value:"POST" > label:<name:"node" value:"bb6f5bf92c76" > label:<name:"path" 
value:"/foo/Bars" > label:<name:"service" value:"/app" > label:<name:"type" value:"http" > counter:
<value:23 > } was collected before with the same name and label values

Looks like the underlying byte array mutates under gramework's feets. Swapping to string() fixes the issue.

Another symptom is that paths where some are longer than others, the shorter ones may get garbage at the end.

[kirillDanshin]

should be fixed in f090fd4

[kirillDanshin]

@dsvensson, please ping me if you have any further questions. for now, I'm closing this issue as fixed.