chore: Fix linter findings for `revive:enforce-map-style` in `plugins/aggregators`, `plugins/common`, `plugins/parsers`, `plugins/processors`, `plugins/secretstores` and `plugins/serializers` (#16039)

plugins/aggregators/basicstats/basicstats.go

@@ -165,7 +165,7 @@ func (b *BasicStats) Add(in telegraf.Metric) {
 
 func (b *BasicStats) Push(acc telegraf.Accumulator) {
 	for _, aggregate := range b.cache {
-		fields := map[string]interface{}{}
+		fields := make(map[string]interface{})
 		for k, v := range aggregate.fields {
 			if b.statsConfig.count {
 				fields[k+"_count"] = v.count

plugins/aggregators/deprecations.go

@@ -3,4 +3,4 @@ package aggregators
 import "github.com/influxdata/telegraf"
 
 // Deprecations lists the deprecated plugins
-var Deprecations = map[string]telegraf.DeprecationInfo{}
+var Deprecations = make(map[string]telegraf.DeprecationInfo)

plugins/aggregators/final/final.go

@@ -69,7 +69,7 @@ func (m *Final) Push(acc telegraf.Accumulator) {
 		if m.KeepOriginalFieldNames {
 			fields = metric.Fields()
 		} else {
-			fields = map[string]any{}
+			fields = make(map[string]any, len(metric.FieldList()))
 			for _, field := range metric.FieldList() {
 				fields[field.Key+"_final"] = field.Value
 			}

plugins/aggregators/histogram/histogram.go

@@ -297,7 +297,7 @@ func convert(in interface{}) (float64, bool) {
 
 // copyTags copies tags
 func copyTags(tags map[string]string) map[string]string {
-	copiedTags := map[string]string{}
+	copiedTags := make(map[string]string, len(tags))
 	for key, val := range tags {
 		copiedTags[key] = val
 	}
@@ -322,7 +322,7 @@ func isTagsIdentical(originalTags, checkedTags map[string]string) bool {
 
 // makeFieldsWithCount assigns count value to all metric fields
 func makeFieldsWithCount(fieldsWithCountIn map[string]int64) map[string]interface{} {
-	fieldsWithCountOut := map[string]interface{}{}
+	fieldsWithCountOut := make(map[string]interface{}, len(fieldsWithCountIn))
 	for field, count := range fieldsWithCountIn {
 		fieldsWithCountOut[field+"_bucket"] = count
 	}

plugins/aggregators/minmax/minmax.go

@@ -81,7 +81,7 @@ func (m *MinMax) Add(in telegraf.Metric) {
 
 func (m *MinMax) Push(acc telegraf.Accumulator) {
 	for _, aggregate := range m.cache {
-		fields := map[string]interface{}{}
+		fields := make(map[string]interface{}, len(aggregate.fields))
 		for k, v := range aggregate.fields {
 			fields[k+"_min"] = v.min
 			fields[k+"_max"] = v.max

plugins/aggregators/quantile/quantile.go

@@ -78,7 +78,7 @@ func (q *Quantile) Add(in telegraf.Metric) {
 
 func (q *Quantile) Push(acc telegraf.Accumulator) {
 	for _, aggregate := range q.cache {
-		fields := map[string]interface{}{}
+		fields := make(map[string]interface{}, len(aggregate.fields)*len(q.Quantiles))
 		for k, algo := range aggregate.fields {
 			for i, qtl := range q.Quantiles {
 				fields[k+q.suffixes[i]] = algo.Quantile(qtl)

plugins/aggregators/registry.go

@@ -4,7 +4,7 @@ import "github.com/influxdata/telegraf"
 
 type Creator func() telegraf.Aggregator
 
-var Aggregators = map[string]Creator{}
+var Aggregators = make(map[string]Creator)
 
 func Add(name string, creator Creator) {
 	Aggregators[name] = creator

plugins/aggregators/valuecounter/valuecounter.go

@@ -65,8 +65,7 @@ func (vc *ValueCounter) Add(in telegraf.Metric) {
 // Push emits the counters
 func (vc *ValueCounter) Push(acc telegraf.Accumulator) {
 	for _, agg := range vc.cache {
-		fields := map[string]interface{}{}
-
+		fields := make(map[string]interface{}, len(agg.fieldCount))
 		for field, count := range agg.fieldCount {
 			fields[field] = count
 		}

plugins/common/opcua/input/input_client.go

@@ -308,7 +308,7 @@ func validateNodeToAdd(existing map[metricParts]struct{}, nmm *NodeMetricMapping
 
 // InitNodeMetricMapping builds nodes from the configuration
 func (o *OpcUAInputClient) InitNodeMetricMapping() error {
-	existing := map[metricParts]struct{}{}
+	existing := make(map[metricParts]struct{}, len(o.Config.RootNodes))
 	for _, node := range o.Config.RootNodes {
 		nmm, err := NewNodeMetricMapping(o.Config.MetricName, node, make(map[string]string))
 		if err != nil {

plugins/common/shim/config.go

@@ -147,9 +147,9 @@ func createPluginsWithTomlConfig(md toml.MetaData, conf config) (loadedConfig, e
 // without having to define a config dead easy.
 func DefaultImportedPlugins() config {
 	conf := config{
-		Inputs:     map[string][]toml.Primitive{},
-		Processors: map[string][]toml.Primitive{},
-		Outputs:    map[string][]toml.Primitive{},
+		Inputs:     make(map[string][]toml.Primitive, len(inputs.Inputs)),
+		Processors: make(map[string][]toml.Primitive, len(processors.Processors)),
+		Outputs:    make(map[string][]toml.Primitive, len(outputs.Outputs)),
 	}
 	for name := range inputs.Inputs {
 		log.Println("No config found. Loading default config for plugin", name)

plugins/parsers/csv/parser.go

@@ -83,7 +83,7 @@ func (record metadataPattern) Less(i, j int) bool {
 
 func (p *Parser) initializeMetadataSeparators() error {
 	// initialize metadata
-	p.metadataTags = map[string]string{}
+	p.metadataTags = make(map[string]string)
 
 	if p.MetadataRows <= 0 {
 		return nil
@@ -94,7 +94,7 @@ func (p *Parser) initializeMetadataSeparators() error {
 	}
 
 	p.metadataSeparatorList = make(metadataPattern, 0, len(p.MetadataSeparators))
-	patternList := map[string]bool{}
+	patternList := make(map[string]bool, len(p.MetadataSeparators))
 	for _, pattern := range p.MetadataSeparators {
 		if patternList[pattern] {
 			// Ignore further, duplicated entries

plugins/parsers/deprecations.go

@@ -3,4 +3,4 @@ package parsers
 import "github.com/influxdata/telegraf"
 
 // Deprecations lists the deprecated plugins
-var Deprecations = map[string]telegraf.DeprecationInfo{}
+var Deprecations = make(map[string]telegraf.DeprecationInfo)

plugins/parsers/dropwizard/parser.go

@@ -196,7 +196,7 @@ func (p *Parser) readDWMetrics(metricType string, dwms interface{}, metrics []te
 			parsed, err := p.seriesParser.Parse([]byte(measurementName))
 			var m telegraf.Metric
 			if err != nil || len(parsed) != 1 {
-				m = metric.New(measurementName, map[string]string{}, map[string]interface{}{}, tm)
+				m = metric.New(measurementName, make(map[string]string), make(map[string]interface{}), tm)
 			} else {
 				m = parsed[0]
 				m.SetTime(tm)

plugins/parsers/graphite/config.go

@@ -24,7 +24,7 @@ func (c *Config) Validate() error {
 
 func (c *Config) validateTemplates() error {
 	// map to keep track of filters we see
-	filters := map[string]struct{}{}
+	filters := make(map[string]struct{}, len(c.Templates))
 
 	for i, template := range c.Templates {
 		parts := strings.Fields(template)

plugins/parsers/graphite/parser.go

@@ -111,7 +111,7 @@ func (p *Parser) ParseLine(line string) (telegraf.Metric, error) {
 		return nil, fmt.Errorf(`field %q value: %w`, fields[0], err)
 	}
 
-	fieldValues := map[string]interface{}{}
+	fieldValues := make(map[string]interface{}, 1)
 	if field != "" {
 		fieldValues[field] = v
 	} else {

plugins/parsers/json_v2/parser.go

@@ -260,8 +260,8 @@ func (p *Parser) processMetric(input []byte, data []DataSet, tag bool, timestamp
 			Tag:         tag,
 			Metric: metric.New(
 				p.measurementName,
-				map[string]string{},
-				map[string]interface{}{},
+				make(map[string]string),
+				make(map[string]interface{}),
 				timestamp,
 			),
 			Result:      result,
@@ -341,8 +341,8 @@ func (p *Parser) expandArray(result metricNode, timestamp time.Time) ([]telegraf
 		result.ForEach(func(_, val gjson.Result) bool {
 			m := metric.New(
 				p.measurementName,
-				map[string]string{},
-				map[string]interface{}{},
+				make(map[string]string),
+				make(map[string]interface{}),
 				timestamp,
 			)
 			if val.IsObject() {
@@ -519,8 +519,8 @@ func (p *Parser) processObjects(input []byte, objects []Object, timestamp time.T
 		rootObject := metricNode{
 			Metric: metric.New(
 				p.measurementName,
-				map[string]string{},
-				map[string]interface{}{},
+				make(map[string]string),
+				make(map[string]interface{}),
 				timestamp,
 			),
 			Result:      result,

plugins/parsers/prometheus/common.go

@@ -21,8 +21,7 @@ func mapValueType(mt dto.MetricType) telegraf.ValueType {
 }
 
 func getTagsFromLabels(m *dto.Metric, defaultTags map[string]string) map[string]string {
-	result := map[string]string{}
-
+	result := make(map[string]string, len(defaultTags)+len(m.Label))
 	for key, value := range defaultTags {
 		result[key] = value
 	}

plugins/parsers/prometheusremotewrite/parser.go

@@ -30,7 +30,7 @@ func (p *Parser) Parse(buf []byte) ([]telegraf.Metric, error) {
 	now := time.Now()
 
 	for _, ts := range req.Timeseries {
-		tags := map[string]string{}
+		tags := make(map[string]string, len(p.DefaultTags)+len(ts.Labels))
 		for key, value := range p.DefaultTags {
 			tags[key] = value
 		}

plugins/parsers/registry.go

@@ -8,7 +8,7 @@ import (
 type Creator func(defaultMetricName string) telegraf.Parser
 
 // Parsers contains the registry of all known parsers (following the new style)
-var Parsers = map[string]Creator{}
+var Parsers = make(map[string]Creator)
 
 // Add adds a parser to the registry. Usually this function is called in the plugin's init function
 func Add(name string, creator Creator) {

plugins/processors/deprecations.go

@@ -3,4 +3,4 @@ package processors
 import "github.com/influxdata/telegraf"
 
 // Deprecations lists the deprecated plugins
-var Deprecations = map[string]telegraf.DeprecationInfo{}
+var Deprecations = make(map[string]telegraf.DeprecationInfo)

plugins/processors/registry.go

@@ -13,7 +13,7 @@ type HasUnwrap interface {
 
 // all processors are streaming processors.
 // telegraf.Processor processors are upgraded to telegraf.StreamingProcessor
-var Processors = map[string]StreamingCreator{}
+var Processors = make(map[string]StreamingCreator)
 
 // Add adds a telegraf.Processor processor
 func Add(name string, creator Creator) {

plugins/processors/reverse_dns/rdnscache.go

@@ -68,7 +68,7 @@ func NewReverseDNSCache(ttl, lookupTimeout time.Duration, workerPoolSize int) *R
 	d := &ReverseDNSCache{
 		ttl:                 ttl,
 		lookupTimeout:       lookupTimeout,
-		cache:               map[string]*dnslookup{},
+		cache:               make(map[string]*dnslookup),
 		maxWorkers:          workerPoolSize,
 		sem:                 semaphore.NewWeighted(int64(workerPoolSize)),
 		cancelCleanupWorker: cancel,

plugins/secretstores/deprecations.go

@@ -3,4 +3,4 @@ package secretstores
 import "github.com/influxdata/telegraf"
 
 // Deprecations lists the deprecated plugins
-var Deprecations = map[string]telegraf.DeprecationInfo{}
+var Deprecations = make(map[string]telegraf.DeprecationInfo)

plugins/secretstores/registry.go

@@ -8,7 +8,7 @@ import (
 type Creator func(id string) telegraf.SecretStore
 
 // SecretStores contains the registry of all known secret-stores
-var SecretStores = map[string]Creator{}
+var SecretStores = make(map[string]Creator)
 
 // Add adds a secret-store to the registry. Usually this function is called in the plugin's init function
 func Add(name string, creator Creator) {

plugins/serializers/deprecations.go

@@ -3,4 +3,4 @@ package serializers
 import "github.com/influxdata/telegraf"
 
 // Deprecations lists the deprecated plugins
-var Deprecations = map[string]telegraf.DeprecationInfo{}
+var Deprecations = make(map[string]telegraf.DeprecationInfo)

plugins/serializers/nowmetric/nowmetric.go

@@ -114,9 +114,7 @@ func (s *Serializer) createObject(metric telegraf.Metric) OIMetrics {
 		oimetric.Value = field.Value
 
 		if oimetric.Node != "" {
-			cimapping := map[string]string{}
-			cimapping["node"] = oimetric.Node
-			oimetric.CiMapping = cimapping
+			oimetric.CiMapping = map[string]string{"node": oimetric.Node}
 		}
 
 		allmetrics = append(allmetrics, oimetric)

plugins/serializers/registry.go

@@ -11,7 +11,7 @@ import (
 type Creator func() Serializer
 
 // Serializers contains the registry of all known serializers (following the new style)
-var Serializers = map[string]Creator{}
+var Serializers = make(map[string]Creator)
 
 // Add adds a serializer to the registry. Usually this function is called in the plugin's init function
 func Add(name string, creator Creator) {

plugins/serializers/splunkmetric/splunkmetric.go

@@ -165,7 +165,7 @@ func (s *Serializer) createObject(metric telegraf.Metric) ([]byte, error) {
 	// The tags are common to all events in this timeseries
 	commonTags := CommonTags{}
 
-	commonTags.Fields = map[string]interface{}{}
+	commonTags.Fields = make(map[string]interface{}, len(metric.Tags()))
 
 	// Break tags out into key(n)=value(t) pairs
 	for n, t := range metric.Tags() {