[8.7](backport #35031) Fix performance issues with processors scaling…

… under agent (#35066)

* Fix performance issues with processors scaling under agent (#35031)

* fix performance issues with processors scaling under agent

* make linter happy

* fix test

* add comment

* move around defaultProcessors

* fix tests, add diagnostics

* fix default processor on filebeat

* change log line

* Update CHANGELOG.next.asciidoc

Adding changelog entry

---------

Co-authored-by: Pierre HILBERT <[email protected]>
(cherry picked from commit ea1293f)

# Conflicts:
#	libbeat/management/management.go

* Fixing conflict

---------

Co-authored-by: Alex K <[email protected]>
Co-authored-by: Pierre HILBERT <[email protected]>

CHANGELOG.next.asciidoc

@@ -37,6 +37,7 @@ https://github.com/elastic/beats/compare/v8.2.0\...main[Check the HEAD diff]
 *Affecting all Beats*
 - Support for multiline zookeeper logs {issue}2496[2496]
 - Fix Beats started by agent do not respect the allow_older_versions: true configuration flag {issue}34227[34227] {pull}34964[34964]
+- Fix performance issues when we have a lot of inputs starting and stopping by allowing to disable global processors under fleet. {issue}35000[35000] {pull}35031[35031]
 
 *Auditbeat*
 

auditbeat/cmd/root.go

@@ -25,6 +25,7 @@ import (
 	"github.com/elastic/beats/v7/libbeat/cmd"
 	"github.com/elastic/beats/v7/libbeat/cmd/instance"
 	"github.com/elastic/beats/v7/libbeat/ecs"
+	"github.com/elastic/beats/v7/libbeat/processors"
 	"github.com/elastic/beats/v7/libbeat/publisher/processing"
 	"github.com/elastic/beats/v7/metricbeat/beater"
 	"github.com/elastic/beats/v7/metricbeat/mb/module"
@@ -53,13 +54,13 @@ var withECSVersion = processing.WithFields(mapstr.M{
 })
 
 // AuditbeatSettings contains the default settings for auditbeat
-func AuditbeatSettings() instance.Settings {
+func AuditbeatSettings(globals processors.PluginConfig) instance.Settings {
 	runFlags := pflag.NewFlagSet(Name, pflag.ExitOnError)
 	return instance.Settings{
 		RunFlags:      runFlags,
 		Name:          Name,
 		HasDashboards: true,
-		Processing:    processing.MakeDefaultSupport(true, withECSVersion, processing.WithHost, processing.WithAgentMeta()),
+		Processing:    processing.MakeDefaultSupport(true, globals, withECSVersion, processing.WithHost, processing.WithAgentMeta()),
 	}
 }
 
@@ -76,5 +77,5 @@ func Initialize(settings instance.Settings) *cmd.BeatsRootCmd {
 }
 
 func init() {
-	RootCmd = Initialize(AuditbeatSettings())
+	RootCmd = Initialize(AuditbeatSettings(nil))
 }

heartbeat/cmd/root.go

@@ -54,7 +54,7 @@ var withECSVersion = processing.WithFields(mapstr.M{
 func HeartbeatSettings() instance.Settings {
 	return instance.Settings{
 		Name:          Name,
-		Processing:    processing.MakeDefaultSupport(true, withECSVersion, processing.WithAgentMeta()),
+		Processing:    processing.MakeDefaultSupport(true, nil, withECSVersion, processing.WithAgentMeta()),
 		HasDashboards: false,
 	}
 }

libbeat/cmd/instance/beat.go

@@ -804,9 +804,26 @@ func (b *Beat) configure(settings Settings) error {
 	}
 	b.processing, err = processingFactory(b.Info, logp.L().Named("processors"), b.RawConfig)
 
+	b.Manager.RegisterDiagnosticHook("global processors", "a list of currently configured global beat processors",
+		"global_processors.txt", "text/plain", b.agentDiagnosticHook)
+
 	return err
 }
 
+// agentDiagnosticHook is the callback function sent to the agent manager RegisterDiagnosticHook function
+// right now, this only returns information on the global processors; however, in the future, we might find it useful
+// to expand this to other components of the beat state.
+// To anyone refactoring: be careful to make sure the callback is registered after the global processors are initialized
+func (b *Beat) agentDiagnosticHook() []byte {
+	list := b.processing.Processors()
+
+	var debugBytes []byte
+	for _, proc := range list {
+		debugBytes = append(debugBytes, []byte(proc+"\n")...)
+	}
+	return debugBytes
+}
+
 func (b *Beat) loadMeta(metaPath string) error {
 	type meta struct {
 		UUID       uuid.UUID `json:"uuid"`

libbeat/management/management.go

@@ -109,6 +109,9 @@ type Manager interface {
 
 	// SetPayload Allows to add additional metadata to future requests made by the manager.
 	SetPayload(map[string]interface{})
+
+	// RegisterDiagnosticHook registers a callback for elastic-agent diagnostics
+	RegisterDiagnosticHook(name string, description string, filename string, contentType string, hook client.DiagnosticHook)
 }
 
 // PluginFunc for creating FactoryFunc if it matches a config
@@ -191,3 +194,5 @@ func (n *nilManager) RegisterAction(action client.Action) {}
 func (n *nilManager) UnregisterAction(action client.Action) {}
 
 func (n *nilManager) SetPayload(map[string]interface{}) {}
+func (n *nilManager) RegisterDiagnosticHook(_ string, _ string, _ string, _ string, _ client.DiagnosticHook) {
+}

libbeat/monitoring/report/elasticsearch/elasticsearch.go

@@ -149,7 +149,7 @@ func makeReporter(beat beat.Info, settings report.Settings, cfg *conf.C) (report
 	outClient := outputs.NewFailoverClient(clients)
 	outClient = outputs.WithBackoff(outClient, config.Backoff.Init, config.Backoff.Max)
 
-	processing, err := processing.MakeDefaultSupport(true)(beat, log, conf.NewConfig())
+	processing, err := processing.MakeDefaultSupport(true, nil)(beat, log, conf.NewConfig())
 	if err != nil {
 		return nil, err
 	}
@@ -282,7 +282,7 @@ func (r *reporter) snapshotLoop(namespace, prefix string, period time.Duration,
 			clusterUUID = getClusterUUID()
 		}
 		if clusterUUID != "" {
-			meta.Put("cluster_uuid", clusterUUID)
+			_, _ = meta.Put("cluster_uuid", clusterUUID)
 		}
 
 		r.client.Publish(beat.Event{

libbeat/processors/config.go

@@ -17,10 +17,29 @@
 
 package processors
 
-import "github.com/elastic/elastic-agent-libs/config"
+import (
+	"fmt"
+
+	"github.com/elastic/elastic-agent-libs/config"
+	"github.com/elastic/elastic-agent-libs/mapstr"
+)
 
 // PluginConfig represents the list of processors.
 type PluginConfig []*config.C
 
-// fields that should be always exported
+// MandatoryExportedFields are fields that should be always exported
 var MandatoryExportedFields = []string{"type"}
+
+// NewPluginConfigFromList creates a PluginConfig from a list of raw processor config objects
+func NewPluginConfigFromList(raw []mapstr.M) (PluginConfig, error) {
+	processors := make([]*config.C, len(raw))
+	for i := 0; i < len(raw); i++ {
+		cfg, err := config.NewConfigFrom(raw[i])
+		if err != nil {
+			return nil, fmt.Errorf("error creating processor config: %w", err)
+		}
+		processors[i] = cfg
+	}
+
+	return processors, nil
+}

libbeat/publisher/pipeline/stress/run.go

@@ -56,12 +56,12 @@ func RunTests(
 ) error {
 	config := defaultConfig
 	if err := cfg.Unpack(&config); err != nil {
-		return fmt.Errorf("unpacking config failed: %v", err)
+		return fmt.Errorf("unpacking config failed: %w", err)
 	}
 
 	log := logp.L()
 
-	processing, err := processing.MakeDefaultSupport(false)(info, log, cfg)
+	processing, err := processing.MakeDefaultSupport(false, nil)(info, log, cfg)
 	if err != nil {
 		return err
 	}
@@ -81,7 +81,7 @@ func RunTests(
 		},
 	)
 	if err != nil {
-		return fmt.Errorf("loading pipeline failed: %+v", err)
+		return fmt.Errorf("loading pipeline failed: %w", err)
 	}
 	defer func() {
 		log.Info("Stop pipeline")

libbeat/publisher/processing/default.go

@@ -22,6 +22,7 @@ import (
 
 	"github.com/elastic/beats/v7/libbeat/asset"
 	"github.com/elastic/beats/v7/libbeat/beat"
+	"github.com/elastic/beats/v7/libbeat/common/fleetmode"
 	"github.com/elastic/beats/v7/libbeat/ecs"
 	"github.com/elastic/beats/v7/libbeat/features"
 	"github.com/elastic/beats/v7/libbeat/mapping"
@@ -77,14 +78,14 @@ type builtinModifier func(beat.Info) mapstr.M
 // MakeDefaultBeatSupport automatically adds the `ecs.version`, `host.name` and `agent.X` fields
 // to each event.
 func MakeDefaultBeatSupport(normalize bool) SupportFactory {
-	return MakeDefaultSupport(normalize, WithECS, WithHost, WithAgentMeta())
+	return MakeDefaultSupport(normalize, nil, WithECS, WithHost, WithAgentMeta())
 }
 
 // MakeDefaultObserverSupport creates a new SupportFactory based on NewDefaultSupport.
 // MakeDefaultObserverSupport automatically adds the `ecs.version` and `observer.X` fields
 // to each event.
 func MakeDefaultObserverSupport(normalize bool) SupportFactory {
-	return MakeDefaultSupport(normalize, WithECS, WithObserverMeta())
+	return MakeDefaultSupport(normalize, nil, WithECS, WithObserverMeta())
 }
 
 // MakeDefaultSupport creates a new SupportFactory for use with the publisher pipeline.
@@ -94,8 +95,11 @@ func MakeDefaultObserverSupport(normalize bool) SupportFactory {
 // and `processor` settings to the event processing pipeline to be generated.
 // Use WithFields, WithBeatMeta, and other to declare the builtin fields to be added
 // to each event. Builtin fields can be modified using global `processors`, and `fields` only.
+// the fleetDefaultProcessors argument will set the given global-level processors if the beat is currently running under fleet,
+// and no other global-level processors are set.
 func MakeDefaultSupport(
 	normalize bool,
+	fleetDefaultProcessors processors.PluginConfig,
 	modifiers ...modifier,
 ) SupportFactory {
 	return func(info beat.Info, log *logp.Logger, beatCfg *config.C) (Supporter, error) {
@@ -107,8 +111,19 @@ func MakeDefaultSupport(
 		if err := beatCfg.Unpack(&cfg); err != nil {
 			return nil, err
 		}
+		// don't try to "merge" the two lists somehow, if the supportFactory caller requests its own processors, use those
+		// also makes it easier to disable global processors if needed, since they're otherwise hardcoded
+		var rawProcessors processors.PluginConfig
+		// don't check the array directly, use HasField, that way processors can easily be bypassed with -E processors=[]
+		if fleetmode.Enabled() && !beatCfg.HasField("processors") {
+			log.Debugf("In fleet mode with no processors specified, defaulting to global processors")
+			rawProcessors = fleetDefaultProcessors
+
+		} else {
+			rawProcessors = cfg.Processors
+		}
 
-		processors, err := processors.New(cfg.Processors)
+		processors, err := processors.New(rawProcessors)
 		if err != nil {
 			return nil, fmt.Errorf("error initializing processors: %w", err)
 		}
@@ -125,7 +140,7 @@ func WithFields(fields mapstr.M) modifier {
 }
 
 // WithECS modifier adds `ecs.version` builtin fields to a processing pipeline.
-var WithECS modifier = WithFields(mapstr.M{
+var WithECS = WithFields(mapstr.M{
 	"ecs": mapstr.M{
 		"version": ecs.Version,
 	},
@@ -243,6 +258,15 @@ func newBuilder(
 	return b, nil
 }
 
+// Processors returns a string description of the processor config
+func (b *builder) Processors() []string {
+	procList := []string{}
+	for _, proc := range b.processors.list {
+		procList = append(procList, proc.String())
+	}
+	return procList
+}
+
 // Create combines the builder configuration with the client settings
 // in order to build the event processing pipeline.
 //

libbeat/publisher/processing/default_test.go

@@ -33,8 +33,30 @@ import (
 	"github.com/elastic/elastic-agent-libs/config"
 	"github.com/elastic/elastic-agent-libs/logp"
 	"github.com/elastic/elastic-agent-libs/mapstr"
+
+	_ "github.com/elastic/beats/v7/libbeat/processors/add_cloud_metadata"
+	_ "github.com/elastic/beats/v7/libbeat/processors/add_docker_metadata"
+	_ "github.com/elastic/beats/v7/libbeat/processors/add_host_metadata"
+	_ "github.com/elastic/beats/v7/libbeat/processors/add_kubernetes_metadata"
 )
 
+func TestGenerateProcessorList(t *testing.T) {
+	inputCfg := []mapstr.M{
+		{"add_host_metadata": nil},
+		{"add_cloud_metadata": nil},
+		{"add_docker_metadata": nil},
+		{"add_kubernetes_metadata": nil},
+	}
+
+	plugins, err := processors.NewPluginConfigFromList(inputCfg)
+	require.NoError(t, err)
+
+	processors, err := processors.New(plugins)
+	require.NoError(t, err)
+	// make sure the processor init got the config formatted in a way it expected
+	require.Equal(t, 4, len(processors.List))
+}
+
 func TestProcessorsConfigs(t *testing.T) {
 	defaultInfo := beat.Info{
 		Beat:        "test",
@@ -258,7 +280,7 @@ func TestProcessorsConfigs(t *testing.T) {
 
 			factory := test.factory
 			if factory == nil {
-				factory = MakeDefaultSupport(true)
+				factory = MakeDefaultSupport(true, nil)
 			}
 
 			support, err := factory(info, logp.L(), cfg)
@@ -343,7 +365,7 @@ func TestNormalization(t *testing.T) {
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 
-			s, err := MakeDefaultSupport(test.normalize)(beat.Info{}, logp.L(), config.NewConfig())
+			s, err := MakeDefaultSupport(test.normalize, nil)(beat.Info{}, logp.L(), config.NewConfig())
 			require.NoError(t, err)
 
 			prog, err := s.Create(beat.ProcessingConfig{}, false)
@@ -364,7 +386,7 @@ func TestNormalization(t *testing.T) {
 }
 
 func BenchmarkNormalization(b *testing.B) {
-	s, err := MakeDefaultSupport(true)(beat.Info{}, logp.L(), config.NewConfig())
+	s, err := MakeDefaultSupport(true, nil)(beat.Info{}, logp.L(), config.NewConfig())
 	require.NoError(b, err)
 
 	prog, err := s.Create(beat.ProcessingConfig{}, false)
@@ -378,7 +400,7 @@ func BenchmarkNormalization(b *testing.B) {
 }
 
 func TestAlwaysDrop(t *testing.T) {
-	s, err := MakeDefaultSupport(true)(beat.Info{}, logp.L(), config.NewConfig())
+	s, err := MakeDefaultSupport(true, nil)(beat.Info{}, logp.L(), config.NewConfig())
 	require.NoError(t, err)
 
 	prog, err := s.Create(beat.ProcessingConfig{}, true)
@@ -393,7 +415,7 @@ func TestAlwaysDrop(t *testing.T) {
 }
 
 func TestDynamicFields(t *testing.T) {
-	factory, err := MakeDefaultSupport(true)(beat.Info{}, logp.L(), config.NewConfig())
+	factory, err := MakeDefaultSupport(true, nil)(beat.Info{}, logp.L(), config.NewConfig())
 	require.NoError(t, err)
 
 	dynFields := mapstr.NewPointer(mapstr.M{})
@@ -416,7 +438,7 @@ func TestDynamicFields(t *testing.T) {
 }
 
 func TestProcessingClose(t *testing.T) {
-	factory, err := MakeDefaultSupport(true)(beat.Info{}, logp.L(), config.NewConfig())
+	factory, err := MakeDefaultSupport(true, nil)(beat.Info{}, logp.L(), config.NewConfig())
 	require.NoError(t, err)
 
 	// Inject a processor in the builder that we can check if has been closed.

libbeat/publisher/processing/processing.go

@@ -35,6 +35,10 @@ type SupportFactory func(info beat.Info, log *logp.Logger, cfg *config.C) (Suppo
 // If `drop` is set, then the processor generated must always drop all events.
 // A Supporter needs to be closed with `Close()` to release its global resources.
 type Supporter interface {
+	// Create a running processor interface based on the given config
 	Create(cfg beat.ProcessingConfig, drop bool) (beat.Processor, error)
+	// Processors returns a list of config strings for the given processor, for debug purposes
+	Processors() []string
+	// Close the processor supporter
 	Close() error
 }

metricbeat/cmd/root.go

@@ -58,7 +58,7 @@ func MetricbeatSettings() instance.Settings {
 		RunFlags:      runFlags,
 		Name:          Name,
 		HasDashboards: true,
-		Processing:    processing.MakeDefaultSupport(true, withECSVersion, processing.WithHost, processing.WithAgentMeta()),
+		Processing:    processing.MakeDefaultSupport(true, nil, withECSVersion, processing.WithHost, processing.WithAgentMeta()),
 	}
 }
 

packetbeat/cmd/root.go

@@ -25,6 +25,7 @@ import (
 	cmd "github.com/elastic/beats/v7/libbeat/cmd"
 	"github.com/elastic/beats/v7/libbeat/cmd/instance"
 	"github.com/elastic/beats/v7/libbeat/ecs"
+	"github.com/elastic/beats/v7/libbeat/processors"
 	"github.com/elastic/beats/v7/libbeat/publisher/processing"
 	"github.com/elastic/beats/v7/packetbeat/beater"
 	"github.com/elastic/elastic-agent-libs/mapstr"
@@ -49,7 +50,7 @@ var withECSVersion = processing.WithFields(mapstr.M{
 var RootCmd *cmd.BeatsRootCmd
 
 // PacketbeatSettings contains the default settings for packetbeat
-func PacketbeatSettings() instance.Settings {
+func PacketbeatSettings(globals processors.PluginConfig) instance.Settings {
 	runFlags := pflag.NewFlagSet(Name, pflag.ExitOnError)
 	runFlags.AddGoFlag(flag.CommandLine.Lookup("I"))
 	runFlags.AddGoFlag(flag.CommandLine.Lookup("t"))
@@ -61,7 +62,7 @@ func PacketbeatSettings() instance.Settings {
 		RunFlags:       runFlags,
 		Name:           Name,
 		HasDashboards:  true,
-		Processing:     processing.MakeDefaultSupport(true, withECSVersion, processing.WithHost, processing.WithAgentMeta()),
+		Processing:     processing.MakeDefaultSupport(true, globals, withECSVersion, processing.WithHost, processing.WithAgentMeta()),
 		InputQueueSize: 400,
 	}
 }
@@ -74,5 +75,5 @@ func Initialize(settings instance.Settings) *cmd.BeatsRootCmd {
 }
 
 func init() {
-	RootCmd = Initialize(PacketbeatSettings())
+	RootCmd = Initialize(PacketbeatSettings(nil))
 }

winlogbeat/cmd/root.go

@@ -52,7 +52,7 @@ func WinlogbeatSettings() instance.Settings {
 	return instance.Settings{
 		Name:          Name,
 		HasDashboards: true,
-		Processing:    processing.MakeDefaultSupport(true, withECSVersion, processing.WithAgentMeta()),
+		Processing:    processing.MakeDefaultSupport(true, nil, withECSVersion, processing.WithAgentMeta()),
 	}
 }