Fix: Endpoint collision between monitoring and regular beats

internal/pkg/agent/control/server/server.go

@@ -26,7 +26,6 @@ import (
 	"github.com/elastic/elastic-agent/internal/pkg/agent/control/proto"
 	"github.com/elastic/elastic-agent/internal/pkg/agent/errors"
 	"github.com/elastic/elastic-agent/internal/pkg/agent/program"
-	"github.com/elastic/elastic-agent/internal/pkg/core/monitoring/beats"
 	monitoring "github.com/elastic/elastic-agent/internal/pkg/core/monitoring/beats"
 	monitoringCfg "github.com/elastic/elastic-agent/internal/pkg/core/monitoring/config"
 	"github.com/elastic/elastic-agent/internal/pkg/core/socket"
@@ -37,6 +36,10 @@ import (
 	"github.com/elastic/elastic-agent/pkg/core/logger"
 )
 
+const (
+	agentName = "elastic-agent"
+)
+
 // Server is the daemon side of the control protocol.
 type Server struct {
 	logger        *logger.Logger
@@ -178,6 +181,7 @@ func (s *Server) Upgrade(ctx context.Context, request *proto.UpgradeRequest) (*p
 	}
 	cb, err := u.Upgrade(ctx, &upgradeRequest{request}, false)
 	if err != nil {
+		//nolint:nilerr // ignore the error, it's part of the response
 		return &proto.UpgradeResponse{
 			Status: proto.ActionStatus_FAILURE,
 			Error:  err.Error(),
@@ -225,7 +229,8 @@ func (s *Server) ProcMeta(ctx context.Context, _ *proto.Empty) (*proto.ProcMetaR
 	// gather spec data for all rk/apps running
 	specs := s.getSpecInfo("", "")
 	for _, si := range specs {
-		endpoint := monitoring.MonitoringEndpoint(si.spec, runtime.GOOS, si.rk)
+		isSidecar := strings.HasSuffix(si.app, "_monitoring")
+		endpoint := monitoring.MonitoringEndpoint(si.spec, runtime.GOOS, si.rk, isSidecar)
 		client := newSocketRequester(si.app, si.rk, endpoint)
 
 		procMeta := client.procMeta(ctx)
@@ -258,9 +263,9 @@ func (s *Server) Pprof(ctx context.Context, req *proto.PprofRequest) (*proto.Ppr
 	ch := make(chan *proto.PprofResult, 1)
 
 	// retrieve elastic-agent pprof data if requested or application is unspecified.
-	if req.AppName == "" || req.AppName == "elastic-agent" {
-		endpoint := beats.AgentMonitoringEndpoint(runtime.GOOS, s.monitoringCfg.HTTP)
-		c := newSocketRequester("elastic-agent", "", endpoint)
+	if req.AppName == "" || req.AppName == agentName {
+		endpoint := monitoring.AgentMonitoringEndpoint(runtime.GOOS, s.monitoringCfg.HTTP)
+		c := newSocketRequester(agentName, "", endpoint)
 		for _, opt := range req.PprofType {
 			wg.Add(1)
 			go func(opt proto.PprofOption) {
@@ -273,11 +278,11 @@ func (s *Server) Pprof(ctx context.Context, req *proto.PprofRequest) (*proto.Ppr
 
 	// get requested rk/appname spec or all specs
 	var specs []specInfo
-	if req.AppName != "elastic-agent" {
+	if req.AppName != agentName {
 		specs = s.getSpecInfo(req.RouteKey, req.AppName)
 	}
 	for _, si := range specs {
-		endpoint := monitoring.MonitoringEndpoint(si.spec, runtime.GOOS, si.rk)
+		endpoint := monitoring.MonitoringEndpoint(si.spec, runtime.GOOS, si.rk, false)
 		c := newSocketRequester(si.app, si.rk, endpoint)
 		// Launch a concurrent goroutine to gather all pprof endpoints from a socket.
 		for _, opt := range req.PprofType {
@@ -315,8 +320,8 @@ func (s *Server) ProcMetrics(ctx context.Context, _ *proto.Empty) (*proto.ProcMe
 	}
 
 	// gather metrics buffer data from the elastic-agent
-	endpoint := beats.AgentMonitoringEndpoint(runtime.GOOS, s.monitoringCfg.HTTP)
-	c := newSocketRequester("elastic-agent", "", endpoint)
+	endpoint := monitoring.AgentMonitoringEndpoint(runtime.GOOS, s.monitoringCfg.HTTP)
+	c := newSocketRequester(agentName, "", endpoint)
 	metrics := c.procMetrics(ctx)
 
 	resp := &proto.ProcMetricsResponse{
@@ -326,7 +331,8 @@ func (s *Server) ProcMetrics(ctx context.Context, _ *proto.Empty) (*proto.ProcMe
 	// gather metrics buffer data from all other processes
 	specs := s.getSpecInfo("", "")
 	for _, si := range specs {
-		endpoint := monitoring.MonitoringEndpoint(si.spec, runtime.GOOS, si.rk)
+		isSidecar := strings.HasSuffix(si.app, "_monitoring")
+		endpoint := monitoring.MonitoringEndpoint(si.spec, runtime.GOOS, si.rk, isSidecar)
 		client := newSocketRequester(si.app, si.rk, endpoint)
 
 		s.logger.Infof("gather metrics from %s", endpoint)

internal/pkg/agent/operation/monitoring_test.go

@@ -212,7 +212,7 @@ type testMonitor struct {
 
 // EnrichArgs enriches arguments provided to application, in order to enable
 // monitoring
-func (b *testMonitor) EnrichArgs(_ program.Spec, _ string, args []string, _ bool) []string {
+func (b *testMonitor) EnrichArgs(_ program.Spec, _ string, args []string) []string {
 	return args
 }
 

internal/pkg/agent/operation/operator.go

@@ -27,7 +27,7 @@ import (
 	"github.com/elastic/elastic-agent/internal/pkg/config"
 	"github.com/elastic/elastic-agent/internal/pkg/core/app"
 	"github.com/elastic/elastic-agent/internal/pkg/core/monitoring"
-	"github.com/elastic/elastic-agent/internal/pkg/core/monitoring/noop"
+	"github.com/elastic/elastic-agent/internal/pkg/core/monitoring/beats"
 	"github.com/elastic/elastic-agent/internal/pkg/core/plugin/process"
 	"github.com/elastic/elastic-agent/internal/pkg/core/plugin/service"
 	"github.com/elastic/elastic-agent/internal/pkg/core/state"
@@ -387,7 +387,7 @@ func (o *Operator) getApp(p Descriptor) (Application, error) {
 	appName := p.BinaryName()
 	if app.IsSidecar(p) {
 		// make watchers unmonitorable
-		monitor = noop.NewMonitor()
+		monitor = beats.NewSidecarMonitor(o.config.DownloadConfig, o.config.MonitoringConfig)
 		appName += "_monitoring"
 	}
 

internal/pkg/core/monitoring/beats/beats_monitor.go

@@ -5,7 +5,6 @@
 package beats
 
 import (
-	"fmt"
 	"net/url"
 	"os"
 	"path/filepath"
@@ -20,8 +19,13 @@ import (
 	monitoringConfig "github.com/elastic/elastic-agent/internal/pkg/core/monitoring/config"
 )
 
-const httpPlusPrefix = "http+"
-const defaultMonitoringNamespace = "default"
+const (
+	httpPlusPrefix             = "http+"
+	defaultMonitoringNamespace = "default"
+	fileSchemePrefix           = "file"
+	unixSchemePrefix           = "unix"
+	windowsOS                  = "windows"
+)
 
 // Monitor implements the monitoring.Monitor interface providing information
 // about beats.
@@ -99,15 +103,11 @@ func (b *Monitor) WatchLogs() bool { return b.config.Enabled && b.config.Monitor
 func (b *Monitor) WatchMetrics() bool { return b.config.Enabled && b.config.MonitorMetrics }
 
 func (b *Monitor) generateMonitoringEndpoint(spec program.Spec, pipelineID string) string {
-	return MonitoringEndpoint(spec, b.operatingSystem, pipelineID)
-}
-
-func (b *Monitor) generateLoggingFile(spec program.Spec, pipelineID string) string {
-	return getLoggingFile(spec, b.operatingSystem, b.installPath, pipelineID)
+	return MonitoringEndpoint(spec, b.operatingSystem, pipelineID, false)
 }
 
 func (b *Monitor) generateLoggingPath(spec program.Spec, pipelineID string) string {
-	return filepath.Dir(b.generateLoggingFile(spec, pipelineID))
+	return filepath.Dir(getLoggingFile(spec, b.operatingSystem, pipelineID))
 }
 
 func (b *Monitor) ownLoggingPath(spec program.Spec) bool {
@@ -118,15 +118,10 @@ func (b *Monitor) ownLoggingPath(spec program.Spec) bool {
 
 // EnrichArgs enriches arguments provided to application, in order to enable
 // monitoring
-func (b *Monitor) EnrichArgs(spec program.Spec, pipelineID string, args []string, isSidecar bool) []string {
+func (b *Monitor) EnrichArgs(spec program.Spec, pipelineID string, args []string) []string {
 	appendix := make([]string, 0, 7)
 
-	monitoringEndpoint := b.generateMonitoringEndpoint(spec, pipelineID)
-	if monitoringEndpoint != "" {
-		endpoint := monitoringEndpoint
-		if isSidecar {
-			endpoint += "_monitor"
-		}
+	if endpoint := b.generateMonitoringEndpoint(spec, pipelineID); endpoint != "" {
 		appendix = append(appendix,
 			"-E", "http.enabled=true",
 			"-E", "http.host="+endpoint,
@@ -146,10 +141,6 @@ func (b *Monitor) EnrichArgs(spec program.Spec, pipelineID string, args []string
 	loggingPath := b.generateLoggingPath(spec, pipelineID)
 	if loggingPath != "" {
 		logFile := spec.Cmd
-		if isSidecar {
-			logFile += "_monitor"
-		}
-		logFile = fmt.Sprintf("%s", logFile)
 		appendix = append(appendix,
 			"-E", "logging.files.path="+loggingPath,
 			"-E", "logging.files.name="+logFile,
@@ -224,7 +215,7 @@ func (b *Monitor) LogPath(spec program.Spec, pipelineID string) string {
 		return ""
 	}
 
-	return b.generateLoggingFile(spec, pipelineID)
+	return getLoggingFile(spec, b.operatingSystem, pipelineID)
 }
 
 // MetricsPath describes a location where application exposes metrics
@@ -272,15 +263,15 @@ func monitoringDrop(path string) (drop string) {
 	}
 
 	u, _ := url.Parse(path)
-	if u == nil || (u.Scheme != "" && u.Scheme != "file" && u.Scheme != "unix") {
+	if u == nil || (u.Scheme != "" && u.Scheme != fileSchemePrefix && u.Scheme != unixSchemePrefix) {
 		return ""
 	}
 
-	if u.Scheme == "file" {
+	if u.Scheme == fileSchemePrefix {
 		return strings.TrimPrefix(path, "file://")
 	}
 
-	if u.Scheme == "unix" {
+	if u.Scheme == unixSchemePrefix {
 		return strings.TrimPrefix(path, "unix://")
 	}
 
@@ -299,7 +290,7 @@ func isWindowsPath(path string) bool {
 }
 
 func changeOwner(path string, uid, gid int) error {
-	if runtime.GOOS == "windows" {
+	if runtime.GOOS == windowsOS {
 		// on windows it always returns the syscall.EWINDOWS error, wrapped in *PathError
 		return nil
 	}

internal/pkg/core/monitoring/beats/monitoring.go

@@ -27,31 +27,39 @@ const (
 	agentMbEndpointFileFormatWin = `npipe:///elastic-agent`
 	// agentMbEndpointHTTP is used with cloud and exposes metrics on http endpoint
 	agentMbEndpointHTTP = "http://%s:%d"
+
+	monitorSuffix = "_monitor"
 )
 
 // MonitoringEndpoint is an endpoint where process is exposing its metrics.
-func MonitoringEndpoint(spec program.Spec, operatingSystem, pipelineID string) string {
+func MonitoringEndpoint(spec program.Spec, operatingSystem, pipelineID string, isSidecar bool) (endpointPath string) {
+	defer func() {
+		if isSidecar && endpointPath != "" {
+			endpointPath += monitorSuffix
+		}
+	}()
+
 	if endpoint, ok := spec.MetricEndpoints[operatingSystem]; ok {
 		return endpoint
 	}
-	if operatingSystem == "windows" {
+	if operatingSystem == windowsOS {
 		return fmt.Sprintf(mbEndpointFileFormatWin, pipelineID, spec.Cmd)
 	}
 	// unix socket path must be less than 104 characters
 	path := fmt.Sprintf("unix://%s.sock", filepath.Join(paths.TempDir(), pipelineID, spec.Cmd, spec.Cmd))
-	if len(path) < 104 {
+	if (isSidecar && len(path) < 104-len(monitorSuffix)) || (!isSidecar && len(path) < 104) {
 		return path
 	}
 	// place in global /tmp (or /var/tmp on Darwin) to ensure that its small enough to fit; current path is way to long
 	// for it to be used, but needs to be unique per Agent (in the case that multiple are running)
 	return fmt.Sprintf(`unix:///tmp/elastic-agent/%x.sock`, sha256.Sum256([]byte(path)))
 }
 
-func getLoggingFile(spec program.Spec, operatingSystem, installPath, pipelineID string) string {
+func getLoggingFile(spec program.Spec, operatingSystem, pipelineID string) string {
 	if path, ok := spec.LogPaths[operatingSystem]; ok {
 		return path
 	}
-	if operatingSystem == "windows" {
+	if operatingSystem == windowsOS {
 		return fmt.Sprintf(logFileFormatWin, paths.Home(), pipelineID, spec.Cmd)
 	}
 	return fmt.Sprintf(logFileFormat, paths.Home(), pipelineID, spec.Cmd)
@@ -63,7 +71,7 @@ func AgentMonitoringEndpoint(operatingSystem string, cfg *monitoringConfig.Monit
 		return fmt.Sprintf(agentMbEndpointHTTP, cfg.Host, cfg.Port)
 	}
 
-	if operatingSystem == "windows" {
+	if operatingSystem == windowsOS {
 		return agentMbEndpointFileFormatWin
 	}
 	// unix socket path must be less than 104 characters