diff --git a/admin/commands/inventory/list_agents.go b/admin/commands/inventory/list_agents.go
index 3c30df270e..3c87e32b00 100644
--- a/admin/commands/inventory/list_agents.go
+++ b/admin/commands/inventory/list_agents.go
@@ -124,7 +124,25 @@ func (cmd *ListAgentsCommand) RunCmd() (commands.Result, error) {
 		return nil, err
 	}
 
-	var agentsList []listResultAgent //nolint:prealloc
+	agentsList := make(
+		[]listResultAgent, 0,
+		len(agentsRes.Payload.PMMAgent)+
+			len(agentsRes.Payload.NodeExporter)+
+			len(agentsRes.Payload.MysqldExporter)+
+			len(agentsRes.Payload.MongodbExporter)+
+			len(agentsRes.Payload.PostgresExporter)+
+			len(agentsRes.Payload.ValkeyExporter)+
+			len(agentsRes.Payload.ProxysqlExporter)+
+			len(agentsRes.Payload.RDSExporter)+
+			len(agentsRes.Payload.QANMysqlPerfschemaAgent)+
+			len(agentsRes.Payload.QANMysqlSlowlogAgent)+
+			len(agentsRes.Payload.QANMongodbProfilerAgent)+
+			len(agentsRes.Payload.QANMongodbMongologAgent)+
+			len(agentsRes.Payload.QANPostgresqlPgstatementsAgent)+
+			len(agentsRes.Payload.QANPostgresqlPgstatmonitorAgent)+
+			len(agentsRes.Payload.ExternalExporter)+
+			len(agentsRes.Payload.RtaMongodbAgent),
+	)
 	for _, a := range agentsRes.Payload.PMMAgent {
 		status := "disconnected"
 		if a.Connected {
@@ -241,6 +259,16 @@ func (cmd *ListAgentsCommand) RunCmd() (commands.Result, error) {
 			Disabled:   a.Disabled,
 		})
 	}
+	for _, a := range agentsRes.Payload.QANMongodbMongologAgent {
+		agentsList = append(agentsList, listResultAgent{
+			AgentType:  types.AgentTypeQANMongoDBMongologAgent,
+			AgentID:    a.AgentID,
+			PMMAgentID: a.PMMAgentID,
+			ServiceID:  a.ServiceID,
+			Status:     getAgentStatus(a.Status),
+			Disabled:   a.Disabled,
+		})
+	}
 	for _, a := range agentsRes.Payload.QANPostgresqlPgstatementsAgent {
 		agentsList = append(agentsList, listResultAgent{
 			AgentType:  types.AgentTypeQANPostgreSQLPgStatementsAgent,
@@ -271,7 +299,6 @@ func (cmd *ListAgentsCommand) RunCmd() (commands.Result, error) {
 			Port:      a.ListenPort,
 		})
 	}
-
 	for _, a := range agentsRes.Payload.RtaMongodbAgent {
 		agentsList = append(agentsList, listResultAgent{
 			AgentType:  types.AgentTypeRTAMongoDBAgent,
diff --git a/admin/commands/inventory/list_services.go b/admin/commands/inventory/list_services.go
index 5c5d6815cd..01ea7b005d 100644
--- a/admin/commands/inventory/list_services.go
+++ b/admin/commands/inventory/list_services.go
@@ -104,7 +104,14 @@ func (cmd *ListServicesCommand) RunCmd() (commands.Result, error) {
 		return net.JoinHostPort(address, strconv.FormatInt(port, 10))
 	}
 
-	var servicesList []listResultService //nolint:prealloc
+	servicesList := make([]listResultService, 0,
+		len(result.Payload.Mysql)+
+			len(result.Payload.Mongodb)+
+			len(result.Payload.Postgresql)+
+			len(result.Payload.Valkey)+
+			len(result.Payload.Proxysql)+
+			len(result.Payload.Haproxy)+
+			len(result.Payload.External))
 	for _, s := range result.Payload.Mysql {
 		servicesList = append(servicesList, listResultService{
 			ServiceType: types.ServiceTypeMySQLService,
diff --git a/admin/commands/list.go b/admin/commands/list.go
index 365a6f035b..9ec1d28bdb 100644
--- a/admin/commands/list.go
+++ b/admin/commands/list.go
@@ -287,8 +287,8 @@ func getMetricsMode(s bool) string {
 }
 
 func agentsList(agentsRes *agents.ListAgentsOK, nodeID string) []listResultAgent {
-	pmmAgentIDs := make(map[string]struct{})
-	agentsList := []listResultAgent{}
+	pmmAgentIDs := make(map[string]struct{}, len(agentsRes.Payload.PMMAgent))
+	agentsList := make([]listResultAgent, 0, len(agentsRes.Payload.PMMAgent))
 
 	agentsList = append(agentsList, pmmAgents(agentsRes, nodeID, pmmAgentIDs)...)
 	agentsList = append(agentsList, nodeExporters(agentsRes, pmmAgentIDs)...)
diff --git a/agent/agents/mongodb/mongolog/internal/monitor_test.go b/agent/agents/mongodb/mongolog/internal/monitor_test.go
index 5ad12411b1..caf246f65d 100644
--- a/agent/agents/mongodb/mongolog/internal/monitor_test.go
+++ b/agent/agents/mongodb/mongolog/internal/monitor_test.go
@@ -154,7 +154,7 @@ func testFileNames(t *testing.T) ([]string, error) {
 		return nil, err
 	}
 
-	var names []string //nolint:prealloc
+	names := make([]string, 0, len(files))
 	for _, file := range files {
 		if file.IsDir() {
 			continue
@@ -171,7 +171,7 @@ func testFileNames(t *testing.T) ([]string, error) {
 func reorderData(t *testing.T, data []proto.SystemProfile) []proto.SystemProfile {
 	t.Helper()
 
-	var res []proto.SystemProfile //nolint:prealloc
+	res := make([]proto.SystemProfile, 0, len(data))
 	for _, d := range data {
 		d.Ts = d.Ts.UTC()
 
@@ -189,7 +189,7 @@ func reorderData(t *testing.T, data []proto.SystemProfile) []proto.SystemProfile
 func reorderBSOND(t *testing.T, data bson.D) bson.D {
 	t.Helper()
 
-	var res []bson.E //nolint:prealloc
+	res := make([]bson.E, 0, len(data))
 	for _, d := range data {
 		res = append(res, d)
 	}
diff --git a/agent/agents/mongodb/profiler/internal/profiler_test.go b/agent/agents/mongodb/profiler/internal/profiler_test.go
index 5c1c8d64e4..92ca43c25f 100644
--- a/agent/agents/mongodb/profiler/internal/profiler_test.go
+++ b/agent/agents/mongodb/profiler/internal/profiler_test.go
@@ -156,7 +156,7 @@ func testProfiler(t *testing.T, url string) {
 	responseLength := float32(45)
 
 	assert.Len(t, bucketsMap, dbsCount) // 300 sample docs / 10 = different database names
-	var buckets []*agentv1.MetricsBucket
+	buckets := make([]*agentv1.MetricsBucket, 0, len(bucketsMap))
 	for _, bucket := range bucketsMap {
 		buckets = append(buckets, bucket)
 	}
diff --git a/agent/agents/mongodb/shared/aggregator/aggregator.go b/agent/agents/mongodb/shared/aggregator/aggregator.go
index 82387f6039..c618fbed17 100644
--- a/agent/agents/mongodb/shared/aggregator/aggregator.go
+++ b/agent/agents/mongodb/shared/aggregator/aggregator.go
@@ -251,7 +251,7 @@ func (a *Aggregator) newInterval(ts time.Time) {
 func (a *Aggregator) createResult(_ context.Context) *report.Result {
 	queries := a.mongostats.Queries()
 	queryStats := queries.CalcQueriesStats(int64(DefaultInterval))
-	var buckets []*agentv1.MetricsBucket //nolint:prealloc
+	buckets := make([]*agentv1.MetricsBucket, 0, len(queryStats))
 
 	a.logger.Tracef("Queries: %#v", queries)
 	a.logger.Tracef("Query Stats: %#v", queryStats)
diff --git a/agent/agents/postgres/parser/parser.go b/agent/agents/postgres/parser/parser.go
index dad76faa23..fb3c1fd93c 100644
--- a/agent/agents/postgres/parser/parser.go
+++ b/agent/agents/postgres/parser/parser.go
@@ -30,7 +30,6 @@ var extractTablesRecover = true
 // ExtractTables extracts table names from query.
 func ExtractTables(query string) ([]string, error) {
 	var err error
-	var tables []string //nolint:prealloc
 
 	if extractTablesRecover {
 		defer func() {
@@ -64,6 +63,7 @@ func ExtractTables(query string) ([]string, error) {
 		delete(tableNames, v)
 	}
 
+	tables := make([]string, 0, len(tableNames))
 	for k := range tableNames {
 		tables = append(tables, k)
 	}
diff --git a/agent/agents/postgres/parser/parser_test.go b/agent/agents/postgres/parser/parser_test.go
index 53ebf14fb7..cd09516748 100644
--- a/agent/agents/postgres/parser/parser_test.go
+++ b/agent/agents/postgres/parser/parser_test.go
@@ -54,7 +54,7 @@ func TestExtractTables(t *testing.T) {
 					t.Parallel()
 
 					actual, err := f(query)
-					assert.Equal(t, expected.Tables, actual)
+					assert.ElementsMatch(t, expected.Tables, actual)
 					if expected.Err != "" {
 						require.EqualError(t, err, expected.Err, "err = %+v", err)
 					} else {
diff --git a/api-tests/management/helpers.go b/api-tests/management/helpers.go
index 77cbf28e00..4f12be3658 100644
--- a/api-tests/management/helpers.go
+++ b/api-tests/management/helpers.go
@@ -141,7 +141,21 @@ func removeAllAgentsInList(t *testing.T, listAgentsOK *agents.ListAgentsOK) {
 	require.NotNil(t, listAgentsOK)
 	require.NotNil(t, listAgentsOK.Payload)
 
-	var agentIDs []string //nolint:prealloc
+	agentIDs := make([]string, 0,
+		len(listAgentsOK.Payload.NodeExporter)+
+			len(listAgentsOK.Payload.PMMAgent)+
+			len(listAgentsOK.Payload.PostgresExporter)+
+			len(listAgentsOK.Payload.MysqldExporter)+
+			len(listAgentsOK.Payload.ProxysqlExporter)+
+			len(listAgentsOK.Payload.QANMysqlPerfschemaAgent)+
+			len(listAgentsOK.Payload.MongodbExporter)+
+			len(listAgentsOK.Payload.QANMongodbProfilerAgent)+
+			len(listAgentsOK.Payload.QANMongodbMongologAgent)+
+			len(listAgentsOK.Payload.QANMysqlSlowlogAgent)+
+			len(listAgentsOK.Payload.QANPostgresqlPgstatementsAgent)+
+			len(listAgentsOK.Payload.ExternalExporter)+
+			len(listAgentsOK.Payload.VMAgent)+
+			len(listAgentsOK.Payload.RtaMongodbAgent))
 	for _, agent := range listAgentsOK.Payload.NodeExporter {
 		agentIDs = append(agentIDs, agent.AgentID)
 	}
@@ -181,6 +195,9 @@ func removeAllAgentsInList(t *testing.T, listAgentsOK *agents.ListAgentsOK) {
 	for _, agent := range listAgentsOK.Payload.VMAgent {
 		agentIDs = append(agentIDs, agent.AgentID)
 	}
+	for _, agent := range listAgentsOK.Payload.RtaMongodbAgent {
+		agentIDs = append(agentIDs, agent.AgentID)
+	}
 
 	pmmapitests.RemoveAgents(t, agentIDs...)
 }
diff --git a/managed/services/agents/vmagent.go b/managed/services/agents/vmagent.go
index 5adb61afae..0ee5406af5 100644
--- a/managed/services/agents/vmagent.go
+++ b/managed/services/agents/vmagent.go
@@ -73,14 +73,13 @@ func vmAgentConfig(scrapeCfg string, params victoriaMetricsParams) *agentv1.SetS
 	interfaceToBind := envvars.GetInterfaceToBind()
 
 	// Only keep the specified exceptions as command line arguments
-	args := []string{
+	args := append([]string{
 		"-envflag.enable=true",
 		"-envflag.prefix=VMAGENT_",
 		"-remoteWrite.tmpDataPath={{.tmp_dir}}/vmagent-temp-dir",
 		"-promscrape.config={{.TextFiles.vmagentscrapecfg}}",
 		"-httpListenAddr=" + interfaceToBind + ":{{.listen_port}}",
-	}
-	args = append(args, params.VMAgentArgs()...)
+	}, params.VMAgentArgs()...)
 
 	sort.Strings(args)
 
diff --git a/managed/services/management/common/common.go b/managed/services/management/common/common.go
index 5669779351..eda30456f5 100644
--- a/managed/services/management/common/common.go
+++ b/managed/services/management/common/common.go
@@ -69,10 +69,12 @@ func (s *MgmtServices) RemoveScheduledTasks(ctx context.Context, db *reform.DB,
 		return err
 	}
 
-	allServices := append(servicesInCurrentCluster, servicesInNewCluster...) //nolint:gocritic
+	allServices := make([]*models.Service, 0, len(servicesInCurrentCluster)+len(servicesInNewCluster)+1)
+	allServices = append(allServices, servicesInCurrentCluster...)
+	allServices = append(allServices, servicesInNewCluster...)
 	allServices = append(allServices, service)
 
-	sMap := make(map[string]struct{})
+	sMap := make(map[string]struct{}, len(allServices))
 	for _, service := range allServices {
 		sMap[service.ServiceID] = struct{}{}
 	}
diff --git a/managed/services/management/rds_test.go b/managed/services/management/rds_test.go
index fed69a8b71..adf5890803 100644
--- a/managed/services/management/rds_test.go
+++ b/managed/services/management/rds_test.go
@@ -230,8 +230,8 @@ func TestRDSService(t *testing.T) {
 				opts := []func(*config.LoadOptions) error{
 					config.WithCredentialsProvider(creds),
 					config.WithHTTPClient(&http.Client{}),
+					config.WithClientLogMode(aws.LogRetries | aws.LogRequestWithBody | aws.LogResponseWithBody),
 				}
-				opts = append(opts, config.WithClientLogMode(aws.LogRetries|aws.LogRequestWithBody|aws.LogResponseWithBody))
 				cfg, err := config.LoadDefaultConfig(ctx, opts...)
 				require.NoError(t, err)
 
diff --git a/managed/services/telemetry/config.go b/managed/services/telemetry/config.go
index df67cbc3a8..2c2be4c22e 100644
--- a/managed/services/telemetry/config.go
+++ b/managed/services/telemetry/config.go
@@ -234,7 +234,7 @@ func (c *ServiceConfig) Init(l *logrus.Entry) error {
 }
 
 func (c *ServiceConfig) loadMetricsConfig(configFile string) ([]Config, error) {
-	var fileConfigs []FileConfig
+	fileConfigs := make([]FileConfig, 0, 1)
 	var fileCfg FileConfig
 
 	var config []byte
diff --git a/managed/services/victoriametrics/prometheus.go b/managed/services/victoriametrics/prometheus.go
index 8026645881..baad556f95 100644
--- a/managed/services/victoriametrics/prometheus.go
+++ b/managed/services/victoriametrics/prometheus.go
@@ -266,11 +266,13 @@ func AddScrapeConfigs(l *logrus.Entry, cfg *config.Config, q *reform.Querier, //
 
 // AddInternalServicesToScrape adds internal services metrics to scrape targets.
 func addInternalServicesToScrape(s models.MetricsResolutions, svc *Service, pmmServerNodeName string) []*config.ScrapeConfig {
-	cfg := []*config.ScrapeConfig{
+	cfg := make([]*config.ScrapeConfig, 0, 4) //nolint:mnd
+	cfg = append(
+		cfg,
 		scrapeConfigForGrafana(s.MR, pmmServerNodeName),
 		scrapeConfigForPMMManaged(s.MR, pmmServerNodeName),
 		scrapeConfigForQANAPI2(s.MR, pmmServerNodeName),
-	}
+	)
 
 	if svc.params.ExternalVM() {
 		return cfg
diff --git a/managed/services/victoriametrics/victoriametrics.go b/managed/services/victoriametrics/victoriametrics.go
index 5af81891f8..9e22d76c48 100644
--- a/managed/services/victoriametrics/victoriametrics.go
+++ b/managed/services/victoriametrics/victoriametrics.go
@@ -261,15 +261,22 @@ func (svc *Service) validateConfig(ctx context.Context, cfg []byte) error {
 	if err != nil {
 		return err
 	}
+	defer func() {
+		err = f.Close()
+		if err != nil {
+			svc.l.Debug(err)
+		}
+		err = os.Remove(f.Name())
+		if err != nil {
+			svc.l.Debug(err)
+		}
+	}()
 	if _, err = f.Write(cfg); err != nil {
 		return err
 	}
-	defer func() {
-		_ = f.Close()
-		_ = os.Remove(f.Name())
-	}()
 
-	args := []string{"-promscrape.config.dryRun=true", "-promscrape.config", f.Name()}
+	args := make([]string, 0, 4) //nolint:mnd
+	args = append(args, "-promscrape.config.dryRun=true", "-promscrape.config", f.Name())
 	cmd := exec.CommandContext(ctx, "victoriametrics", args...) //nolint:gosec
 	pdeathsig.Set(cmd, unix.SIGKILL)
 
diff --git a/managed/utils/encryption/helpers.go b/managed/utils/encryption/helpers.go
index 01a31f2762..8a5866f623 100644
--- a/managed/utils/encryption/helpers.go
+++ b/managed/utils/encryption/helpers.go
@@ -86,7 +86,7 @@ func decryptColumnStringHandler(e *Encryption, val any) (any, error) {
 }
 
 func (table Table) columnsList() []string {
-	res := []string{}
+	res := make([]string, 0, len(table.Columns))
 	for _, c := range table.Columns {
 		res = append(res, c.Name)
 	}
diff --git a/qan-api2/models/metrics.go b/qan-api2/models/metrics.go
index b0809214df..a19ec1259d 100644
--- a/qan-api2/models/metrics.go
+++ b/qan-api2/models/metrics.go
@@ -1295,7 +1295,7 @@ func (m *Metrics) GetSelectedQueryMetadata(ctx context.Context, periodStartFromS
 }
 
 func prepareMetadataProperty(metadata map[string]struct{}) string {
-	res := []string{}
+	res := make([]string, 0, len(metadata))
 	for k := range metadata {
 		res = append(res, k)
 	}
diff --git a/qan-api2/services/analytics/profile.go b/qan-api2/services/analytics/profile.go
index c517d8de5b..976c5b14e7 100644
--- a/qan-api2/services/analytics/profile.go
+++ b/qan-api2/services/analytics/profile.go
@@ -59,7 +59,7 @@ func (s *Service) GetReport(ctx context.Context, in *qanpb.GetReportRequest) (*q
 		labels[label.Key] = label.Value
 	}
 
-	var columns []string //nolint:prealloc
+	columns := make([]string, 0, len(in.Columns))
 	for _, col := range in.Columns {
 		// TODO: remove when UI starts using num_queries instead.
 		if col == "count" {
diff --git a/qan-api2/services/analytics/profile_test.go b/qan-api2/services/analytics/profile_test.go
index 31be418036..621148108d 100644
--- a/qan-api2/services/analytics/profile_test.go
+++ b/qan-api2/services/analytics/profile_test.go
@@ -549,7 +549,7 @@ func TestService_GetReport_AllLabels(t *testing.T) {
 	}
 
 	genDimensionvalues := func(dimKey string, amount int) []string {
-		arr := []string{}
+		arr := make([]string, 0, amount)
 		for i := range amount {
 			arr = append(arr, fmt.Sprintf("%s%d", dimKey, i))
 		}