feat(admin): Add pprof endpoints

To aid us in debugging user issues with memory or leaks we need to be able for the user to configure pprof, wait and then provide us the output files to see where memory/leaks occur in actual runtimes

main.go

@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"net"
 	"net/http"
+	"net/http/pprof"
 	"net/netip"
 	"os"
 	"os/signal"
@@ -147,6 +148,7 @@ var (
 	adminAddr         string
 	region            string
 	metricsAsyncBytes bool
+	pprofEnabled      bool
 	blueprintFile     string
 	noCloud           bool
 
@@ -225,6 +227,7 @@ func runNewtMain(ctx context.Context) {
 	adminAddrEnv := os.Getenv("NEWT_ADMIN_ADDR")
 	regionEnv := os.Getenv("NEWT_REGION")
 	asyncBytesEnv := os.Getenv("NEWT_METRICS_ASYNC_BYTES")
+	pprofEnabledEnv := os.Getenv("NEWT_PPROF_ENABLED")
 
 	disableClientsEnv := os.Getenv("DISABLE_CLIENTS")
 	disableClients = disableClientsEnv == "true"
@@ -390,6 +393,14 @@ func runNewtMain(ctx context.Context) {
 			metricsAsyncBytes = v
 		}
 	}
+	// pprof debug endpoint toggle
+	if pprofEnabledEnv == "" {
+		flag.BoolVar(&pprofEnabled, "pprof", false, "Enable pprof debug endpoints on admin server")
+	} else {
+		if v, err := strconv.ParseBool(pprofEnabledEnv); err == nil {
+			pprofEnabled = v
+		}
+	}
 	// Optional region flag (resource attribute)
 	if regionEnv == "" {
 		flag.StringVar(&region, "region", "", "Optional region resource attribute (also NEWT_REGION)")
@@ -485,6 +496,14 @@ func runNewtMain(ctx context.Context) {
 		if tel.PrometheusHandler != nil {
 			mux.Handle("/metrics", tel.PrometheusHandler)
 		}
+		if pprofEnabled {
+			mux.HandleFunc("/debug/pprof/", pprof.Index)
+			mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
+			mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
+			mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
+			mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
+			logger.Info("pprof debugging enabled on %s/debug/pprof/", tcfg.AdminAddr)
+		}
 		admin := &http.Server{
 			Addr:              tcfg.AdminAddr,
 			Handler:           otelhttp.NewHandler(mux, "newt-admin"),