serve metrics under /metrics

Gopkg.lock

@@ -173,7 +173,10 @@
 
 [[projects]]
   name = "github.com/prometheus/client_golang"
-  packages = ["prometheus"]
+  packages = [
+    "prometheus",
+    "prometheus/promhttp"
+  ]
   revision = "c5b7fccd204277076155f10851dad72b76a49317"
   version = "v0.8.0"
 
@@ -423,6 +426,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "294ac88a5b44228f5ef841b13602d0a8b8fed5fbe9b9b6df77640d636175be16"
+  inputs-digest = "3bd388e520a08cd0aa14df2d6f5ecb46449d7c36fd80cf52eb775798e6accbaa"
   solver-name = "gps-cdcl"
   solver-version = 1

consensus/state.go

@@ -391,8 +391,8 @@ func (cs *ConsensusState) SetProposalAndBlock(proposal *types.Proposal, block *t
 // internal functions for managing the state
 
 func (cs *ConsensusState) updateHeight(height int64) {
-	cs.Height = height
 	cs.metrics.Height.Add(float64(height - cs.Height))
+	cs.Height = height
 }
 
 func (cs *ConsensusState) updateRoundStep(round int, step cstypes.RoundStepType) {

node/node.go

@@ -9,6 +9,7 @@ import (
 
 	prometheus "github.com/go-kit/kit/metrics/prometheus"
 	stdprometheus "github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 
 	abci "github.com/tendermint/abci/types"
 	amino "github.com/tendermint/go-amino"
@@ -532,6 +533,7 @@ func (n *Node) startRPC() ([]net.Listener, error) {
 		wm := rpcserver.NewWebsocketManager(rpccore.Routes, coreCodec, rpcserver.EventSubscriber(n.eventBus))
 		wm.SetLogger(rpcLogger.With("protocol", "websocket"))
 		mux.HandleFunc("/websocket", wm.WebsocketHandler)
+		mux.Handle("/metrics", promhttp.Handler())
 		rpcserver.RegisterRPCFuncs(mux, rpccore.Routes, coreCodec, rpcLogger)
 		listener, err := rpcserver.StartHTTPServer(listenAddr, mux, rpcLogger)
 		if err != nil {