[MM-54289] Add heap profile to support package (#24476)

server/channels/app/support_packet.go

@@ -4,9 +4,11 @@
 package app
 
 import (
+	"bytes"
 	"encoding/json"
 	"os"
 	"runtime"
+	"runtime/pprof"
 	"strings"
 
 	"github.com/hashicorp/go-multierror"
@@ -33,6 +35,7 @@ func (a *App) GenerateSupportPacket(c *request.Context) []model.FileData {
 		"config":           a.createSanitizedConfigFile,
 		"mattermost log":   a.getMattermostLog,
 		"notification log": a.getNotificationsLog,
+		"heap profile":     a.createHeapProfile,
 	}
 
 	for name, fn := range functions {
@@ -290,3 +293,18 @@ func (a *App) createSanitizedConfigFile(_ *request.Context) (*model.FileData, er
 	}
 	return fileData, nil
 }
+
+func (a *App) createHeapProfile(*request.Context) (*model.FileData, error) {
+	var b bytes.Buffer
+
+	err := pprof.Lookup("heap").WriteTo(&b, 0)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to lookup heap profile")
+	}
+
+	fileData := &model.FileData{
+		Filename: "heap.prof",
+		Body:     b.Bytes(),
+	}
+	return fileData, nil
+}