• use common/expfmt instead of local http fetch for PushGateway #29
• change summary to histogram #35
• Allow dump request/response body to opentracing's tags #38
• chore: upgrade prometheus to v1.5.1 #40
• adding pprof middleware #42
• feat(casbin): let the caller decide the method of user identification #41
• adding zipkin open tracing #48
• fixing prometheus test #49