consul: Expose runtime stats for debugging

consul/client.go

@@ -342,6 +342,7 @@ func (c *Client) Stats() map[string]map[string]string {
 			"known_servers": toString(uint64(len(c.consuls))),
 		},
 		"serf_lan": c.serf.Stats(),
+		"runtime":  runtimeStats(),
 	}
 	return stats
 }

consul/server.go

@@ -528,6 +528,7 @@ func (s *Server) Stats() map[string]map[string]string {
 		"raft":     s.raft.Stats(),
 		"serf_lan": s.serfLAN.Stats(),
 		"serf_wan": s.serfWAN.Stats(),
+		"runtime":  runtimeStats(),
 	}
 	return stats
 }

consul/util.go

@@ -7,6 +7,7 @@ import (
 	"net"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strconv"
 )
 
@@ -139,3 +140,15 @@ func uint64ToBytes(u uint64) []byte {
 	binary.BigEndian.PutUint64(buf, u)
 	return buf
 }
+
+// runtimeStats is used to return various runtime information
+func runtimeStats() map[string]string {
+	return map[string]string{
+		"os":         runtime.GOOS,
+		"arch":       runtime.GOARCH,
+		"version":    runtime.Version(),
+		"max_procs":  strconv.FormatInt(int64(runtime.GOMAXPROCS(0)), 10),
+		"goroutines": strconv.FormatInt(int64(runtime.NumGoroutine()), 10),
+		"cpu_count":  strconv.FormatInt(int64(runtime.NumCPU()), 10),
+	}
+}