chore(e2e): Added build tag for enabling pprof tracing (#5839)

* added pprof tag and make command
* updated tracing readme

internal/cmd/base/pprof_off.go

@@ -0,0 +1,14 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: BUSL-1.1
+
+//go:build !pprof
+// +build !pprof
+
+package base
+
+import (
+	"context"
+)
+
+func StartPprof(_ context.Context) {
+}

internal/cmd/base/pprof_on.go

@@ -0,0 +1,28 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: BUSL-1.1
+
+//go:build pprof
+// +build pprof
+
+package base
+
+import (
+	"context"
+	"errors"
+	"net/http"
+
+	"github.com/hashicorp/boundary/internal/event"
+
+	_ "net/http/pprof"
+)
+
+func StartPprof(ctx context.Context) {
+	const op = "base.StartPprof"
+	go func() {
+		const addr = "localhost:6060"
+		event.WriteSysEvent(ctx, op, "starting pprof HTTP server", "addr", addr)
+		if err := http.ListenAndServe(addr, nil); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			event.WriteSysEvent(ctx, op, "failed to serve pprof HTTP server", "error", err.Error())
+		}
+	}()
+}

internal/cmd/commands/dev/dev.go

@@ -722,6 +722,8 @@ func (c *Command) Run(args []string) int {
 		return base.CommandCliError
 	}
 
+	base.StartPprof(c.Context)
+
 	if c.flagRecoveryKey != "" {
 		c.Config.DevRecoveryKey = c.flagRecoveryKey
 	}

internal/cmd/commands/server/server.go

@@ -217,6 +217,7 @@ func (c *Command) Run(args []string) int {
 	c.WorkerAuthDebuggingEnabled.Store(c.Config.EnableWorkerAuthDebugging)
 
 	base.StartMemProfiler(c.Context)
+	base.StartPprof(c.Context)
 
 	// Note: the checks directly after this must remain where they are because
 	// they rely on the state of configured KMSes.