chore: Fix linter findings for `revive:unused-receiver` in `plugins/outputs` (#16338)

plugins/outputs/amon/amon.go

@@ -140,7 +140,7 @@ func (p *Point) setValue(v interface{}) error {
 	return nil
 }
 
-func (a *Amon) Close() error {
+func (*Amon) Close() error {
 	return nil
 }
 

plugins/outputs/amqp/amqp.go

@@ -32,11 +32,11 @@ const (
 
 type externalAuth struct{}
 
-func (a *externalAuth) Mechanism() string {
+func (*externalAuth) Mechanism() string {
 	return "EXTERNAL"
 }
 
-func (a *externalAuth) Response() string {
+func (*externalAuth) Response() string {
 	return "\000"
 }
 

plugins/outputs/application_insights/diagnostic_message_subscriber.go

@@ -7,6 +7,6 @@ import (
 type diagnosticsMessageSubscriber struct {
 }
 
-func (ms diagnosticsMessageSubscriber) Subscribe(handler appinsights.DiagnosticsMessageHandler) appinsights.DiagnosticsMessageListener {
+func (diagnosticsMessageSubscriber) Subscribe(handler appinsights.DiagnosticsMessageHandler) appinsights.DiagnosticsMessageListener {
 	return appinsights.NewDiagnosticsMessageListener(handler)
 }

plugins/outputs/azure_data_explorer/azure_data_explorer_test.go

@@ -329,11 +329,11 @@ func (f *fakeIngestor) FromReader(_ context.Context, reader io.Reader, _ ...inge
 	return &ingest.Result{}, nil
 }
 
-func (f *fakeIngestor) FromFile(_ context.Context, _ string, _ ...ingest.FileOption) (*ingest.Result, error) {
+func (*fakeIngestor) FromFile(context.Context, string, ...ingest.FileOption) (*ingest.Result, error) {
 	return &ingest.Result{}, nil
 }
 
-func (f *fakeIngestor) Close() error {
+func (*fakeIngestor) Close() error {
 	return nil
 }
 
@@ -351,7 +351,7 @@ func (m *mockIngestor) FromReader(_ context.Context, reader io.Reader, _ ...inge
 	return &ingest.Result{}, nil
 }
 
-func (m *mockIngestor) FromFile(_ context.Context, _ string, _ ...ingest.FileOption) (*ingest.Result, error) {
+func (*mockIngestor) FromFile(context.Context, string, ...ingest.FileOption) (*ingest.Result, error) {
 	return &ingest.Result{}, nil
 }
 
@@ -364,6 +364,6 @@ func (m *mockIngestor) Records() []string {
 	return m.records
 }
 
-func (m *mockIngestor) Close() error {
+func (*mockIngestor) Close() error {
 	return nil
 }

plugins/outputs/bigquery/bigquery.go

@@ -118,7 +118,7 @@ func (s *BigQuery) Write(metrics []telegraf.Metric) error {
 		return s.writeCompact(metrics)
 	}
 
-	groupedMetrics := s.groupByMetricName(metrics)
+	groupedMetrics := groupByMetricName(metrics)
 
 	var wg sync.WaitGroup
 
@@ -155,7 +155,7 @@ func (s *BigQuery) writeCompact(metrics []telegraf.Metric) error {
 	return inserter.Put(ctx, compactValues)
 }
 
-func (s *BigQuery) groupByMetricName(metrics []telegraf.Metric) map[string][]bigquery.ValueSaver {
+func groupByMetricName(metrics []telegraf.Metric) map[string][]bigquery.ValueSaver {
 	groupedMetrics := make(map[string][]bigquery.ValueSaver)
 
 	for _, m := range metrics {

plugins/outputs/clarify/clarify.go

@@ -76,7 +76,7 @@ func (c *Clarify) Init() error {
 	return errors.New("no credentials provided")
 }
 
-func (c *Clarify) Connect() error {
+func (*Clarify) Connect() error {
 	return nil
 }
 
@@ -172,7 +172,7 @@ func (c *Clarify) generateID(m telegraf.Metric, f *telegraf.Field) (string, erro
 	return id, nil
 }
 
-func (c *Clarify) SampleConfig() string {
+func (*Clarify) SampleConfig() string {
 	return sampleConfig
 }
 

plugins/outputs/cloud_pubsub/topic_stubbed.go

@@ -103,7 +103,7 @@ func getTestResources(tT *testing.T, settings pubsub.PublishSettings, testM []te
 	return ps, t, metrics
 }
 
-func (t *stubTopic) ID() string {
+func (*stubTopic) ID() string {
 	return "test-topic"
 }
 

plugins/outputs/cloudwatch_logs/cloudwatch_logs.go

@@ -212,7 +212,7 @@ func (c *CloudWatchLogs) Connect() error {
 }
 
 // Close closes plugin connection with remote receiver
-func (c *CloudWatchLogs) Close() error {
+func (*CloudWatchLogs) Close() error {
 	return nil
 }
 

plugins/outputs/cloudwatch_logs/cloudwatch_logs_test.go

@@ -28,7 +28,7 @@ func (c *mockCloudWatchLogs) Init(lsName string) {
 	c.pushedLogEvents = make([]types.InputLogEvent, 0)
 }
 
-func (c *mockCloudWatchLogs) DescribeLogGroups(
+func (*mockCloudWatchLogs) DescribeLogGroups(
 	context.Context,
 	*cloudwatchlogs.DescribeLogGroupsInput,
 	...func(options *cloudwatchlogs.Options),
@@ -60,7 +60,7 @@ func (c *mockCloudWatchLogs) DescribeLogStreams(
 	return output, nil
 }
 
-func (c *mockCloudWatchLogs) CreateLogStream(
+func (*mockCloudWatchLogs) CreateLogStream(
 	context.Context,
 	*cloudwatchlogs.CreateLogStreamInput,
 	...func(options *cloudwatchlogs.Options),

plugins/outputs/datadog/datadog.go

@@ -270,7 +270,7 @@ func (p *Point) setValue(v interface{}) error {
 	return nil
 }
 
-func (d *Datadog) Close() error {
+func (*Datadog) Close() error {
 	return nil
 }
 

plugins/outputs/discard/discard.go

@@ -17,9 +17,9 @@ func (*Discard) SampleConfig() string {
 	return sampleConfig
 }
 
-func (d *Discard) Connect() error { return nil }
-func (d *Discard) Close() error   { return nil }
-func (d *Discard) Write(_ []telegraf.Metric) error {
+func (*Discard) Connect() error { return nil }
+func (*Discard) Close() error   { return nil }
+func (*Discard) Write([]telegraf.Metric) error {
 	return nil
 }
 

plugins/outputs/dynatrace/dynatrace.go

@@ -52,7 +52,7 @@ func (*Dynatrace) SampleConfig() string {
 }
 
 // Connect Connects the Dynatrace output plugin to the Telegraf stream
-func (d *Dynatrace) Connect() error {
+func (*Dynatrace) Connect() error {
 	return nil
 }
 
@@ -231,8 +231,8 @@ func init() {
 
 func (d *Dynatrace) getTypeOption(metric telegraf.Metric, field *telegraf.Field) dynatrace_metric.MetricOption {
 	metricName := metric.Name() + "." + field.Key
-	if d.isCounterMetricsMatch(d.AddCounterMetrics, metricName) ||
-		d.isCounterMetricsPatternsMatch(d.AddCounterMetricsPatterns, metricName) {
+	if isCounterMetricsMatch(d.AddCounterMetrics, metricName) ||
+		isCounterMetricsPatternsMatch(d.AddCounterMetricsPatterns, metricName) {
 		switch v := field.Value.(type) {
 		case float64:
 			return dynatrace_metric.WithFloatCounterValueDelta(v)
@@ -261,7 +261,7 @@ func (d *Dynatrace) getTypeOption(metric telegraf.Metric, field *telegraf.Field)
 	return nil
 }
 
-func (d *Dynatrace) isCounterMetricsMatch(counterMetrics []string, metricName string) bool {
+func isCounterMetricsMatch(counterMetrics []string, metricName string) bool {
 	for _, i := range counterMetrics {
 		if i == metricName {
 			return true
@@ -270,7 +270,7 @@ func (d *Dynatrace) isCounterMetricsMatch(counterMetrics []string, metricName st
 	return false
 }
 
-func (d *Dynatrace) isCounterMetricsPatternsMatch(counterPatterns []string, metricName string) bool {
+func isCounterMetricsPatternsMatch(counterPatterns []string, metricName string) bool {
 	for _, pattern := range counterPatterns {
 		regex, err := regexp.Compile(pattern)
 		if err == nil && regex.MatchString(metricName) {

plugins/outputs/dynatrace/dynatrace_test.go

@@ -836,7 +836,7 @@ type loggerStub struct {
 	testutil.Logger
 }
 
-func (l loggerStub) Warnf(_ string, _ ...interface{}) {
+func (loggerStub) Warnf(string, ...interface{}) {
 	warnfCalledTimes++
 }
 

plugins/outputs/elasticsearch/elasticsearch.go

@@ -245,8 +245,8 @@ func (a *Elasticsearch) Connect() error {
 		}
 	}
 
-	a.IndexName, a.tagKeys = a.GetTagKeys(a.IndexName)
-	a.pipelineName, a.pipelineTagKeys = a.GetTagKeys(a.UsePipeline)
+	a.IndexName, a.tagKeys = GetTagKeys(a.IndexName)
+	a.pipelineName, a.pipelineTagKeys = GetTagKeys(a.UsePipeline)
 
 	return nil
 }
@@ -424,7 +424,7 @@ func (a *Elasticsearch) createNewTemplate(templatePattern string) (*bytes.Buffer
 	return &tmpl, nil
 }
 
-func (a *Elasticsearch) GetTagKeys(indexName string) (string, []string) {
+func GetTagKeys(indexName string) (string, []string) {
 	tagKeys := make([]string, 0)
 	startTag := strings.Index(indexName, "{{")
 

plugins/outputs/elasticsearch/elasticsearch_test.go

@@ -403,11 +403,6 @@ func TestTemplateInvalidIndexPatternIntegration(t *testing.T) {
 }
 
 func TestGetTagKeys(t *testing.T) {
-	e := &Elasticsearch{
-		DefaultTagValue: "none",
-		Log:             testutil.Logger{},
-	}
-
 	tests := []struct {
 		IndexName         string
 		ExpectedIndexName string
@@ -452,7 +447,7 @@ func TestGetTagKeys(t *testing.T) {
 		},
 	}
 	for _, test := range tests {
-		indexName, tagKeys := e.GetTagKeys(test.IndexName)
+		indexName, tagKeys := GetTagKeys(test.IndexName)
 		if indexName != test.ExpectedIndexName {
 			t.Errorf("Expected indexname %s, got %s\n", test.ExpectedIndexName, indexName)
 		}
@@ -553,7 +548,7 @@ func TestGetPipelineName(t *testing.T) {
 		DefaultPipeline: "myDefaultPipeline",
 		Log:             testutil.Logger{},
 	}
-	e.pipelineName, e.pipelineTagKeys = e.GetTagKeys(e.UsePipeline)
+	e.pipelineName, e.pipelineTagKeys = GetTagKeys(e.UsePipeline)
 
 	tests := []struct {
 		EventTime       time.Time
@@ -591,7 +586,7 @@ func TestGetPipelineName(t *testing.T) {
 	e = &Elasticsearch{
 		Log: testutil.Logger{},
 	}
-	e.pipelineName, e.pipelineTagKeys = e.GetTagKeys(e.UsePipeline)
+	e.pipelineName, e.pipelineTagKeys = GetTagKeys(e.UsePipeline)
 
 	for _, test := range tests {
 		pipelineName := e.getPipelineName(e.pipelineName, e.pipelineTagKeys, test.Tags)
@@ -669,7 +664,7 @@ func TestPipelineConfigs(t *testing.T) {
 
 	for _, test := range tests {
 		e := test.Elastic
-		e.pipelineName, e.pipelineTagKeys = e.GetTagKeys(e.UsePipeline)
+		e.pipelineName, e.pipelineTagKeys = GetTagKeys(e.UsePipeline)
 		pipelineName := e.getPipelineName(e.pipelineName, e.pipelineTagKeys, test.Tags)
 		require.Equal(t, test.Expected, pipelineName)
 	}

plugins/outputs/event_hubs/event_hubs.go

@@ -86,7 +86,7 @@ func (e *EventHubs) Init() error {
 	return nil
 }
 
-func (e *EventHubs) Connect() error {
+func (*EventHubs) Connect() error {
 	return nil
 }
 

plugins/outputs/exec/exec.go

@@ -51,12 +51,12 @@ func (e *Exec) SetSerializer(serializer telegraf.Serializer) {
 }
 
 // Connect satisfies the Output interface.
-func (e *Exec) Connect() error {
+func (*Exec) Connect() error {
 	return nil
 }
 
 // Close satisfies the Output interface.
-func (e *Exec) Close() error {
+func (*Exec) Close() error {
 	return nil
 }
 
@@ -123,7 +123,7 @@ func (c *CommandRunner) Run(timeout time.Duration, command, environments []strin
 		s = removeWindowsCarriageReturns(s)
 		if s.Len() > 0 {
 			if c.log.Level() < telegraf.Debug {
-				c.log.Errorf("Command error: %q", c.truncate(s))
+				c.log.Errorf("Command error: %q", truncate(s))
 			} else {
 				c.log.Debugf("Command error: %q", s)
 			}
@@ -141,7 +141,7 @@ func (c *CommandRunner) Run(timeout time.Duration, command, environments []strin
 	return nil
 }
 
-func (c *CommandRunner) truncate(buf bytes.Buffer) string {
+func truncate(buf bytes.Buffer) string {
 	// Limit the number of bytes.
 	didTruncate := false
 	if buf.Len() > maxStderrBytes {

plugins/outputs/exec/exec_test.go

@@ -166,10 +166,10 @@ func TestTruncate(t *testing.T) {
 			len:  len("hola") + len("..."),
 		},
 	}
-	c := CommandRunner{}
+
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			s := c.truncate(*tt.buf)
+			s := truncate(*tt.buf)
 			require.Len(t, s, tt.len)
 		})
 	}

plugins/outputs/graylog/graylog.go

@@ -203,7 +203,7 @@ func (g *gelfUDP) getChunksize() int {
 	return g.gelfConfig.MaxChunkSizeWan
 }
 
-func (g *gelfUDP) intToBytes(i int) ([]byte, error) {
+func (*gelfUDP) intToBytes(i int) ([]byte, error) {
 	buf := new(bytes.Buffer)
 
 	err := binary.Write(buf, binary.LittleEndian, int8(i))
@@ -214,7 +214,7 @@ func (g *gelfUDP) intToBytes(i int) ([]byte, error) {
 	return buf.Bytes(), err
 }
 
-func (g *gelfUDP) compress(b []byte) (bytes.Buffer, error) {
+func (*gelfUDP) compress(b []byte) (bytes.Buffer, error) {
 	var buf bytes.Buffer
 	comp := zlib.NewWriter(&buf)
 

plugins/outputs/influxdb/http.go

@@ -230,7 +230,7 @@ func (c *httpClient) CreateDatabase(ctx context.Context, database string) error
 	}
 	defer resp.Body.Close()
 
-	body, err := c.validateResponse(resp.Body)
+	body, err := validateResponse(resp.Body)
 
 	// Check for poorly formatted response (can't be decoded)
 	if err != nil {
@@ -363,7 +363,7 @@ func (c *httpClient) writeBatch(ctx context.Context, db, rp string, metrics []te
 		return nil
 	}
 
-	body, err := c.validateResponse(resp.Body)
+	body, err := validateResponse(resp.Body)
 
 	// Check for poorly formatted response that can't be decoded
 	if err != nil {
@@ -526,7 +526,7 @@ func (c *httpClient) addHeaders(req *http.Request) error {
 	return nil
 }
 
-func (c *httpClient) validateResponse(response io.ReadCloser) (io.ReadCloser, error) {
+func validateResponse(response io.ReadCloser) (io.ReadCloser, error) {
 	bodyBytes, err := io.ReadAll(response)
 	if err != nil {
 		return nil, err

plugins/outputs/influxdb/udp.go

@@ -80,7 +80,7 @@ func (c *udpClient) URL() string {
 	return c.url.String()
 }
 
-func (c *udpClient) Database() string {
+func (*udpClient) Database() string {
 	return ""
 }
 
@@ -118,7 +118,7 @@ func (c *udpClient) Write(ctx context.Context, metrics []telegraf.Metric) error
 	return nil
 }
 
-func (c *udpClient) CreateDatabase(_ context.Context, _ string) error {
+func (*udpClient) CreateDatabase(_ context.Context, _ string) error {
 	return nil
 }
 
@@ -141,5 +141,5 @@ func scanLines(data []byte, atEOF bool) (advance int, token []byte, err error) {
 	return 0, nil, nil
 }
 
-func (c *udpClient) Close() {
+func (*udpClient) Close() {
 }

plugins/outputs/kafka/kafka_test.go

@@ -182,7 +182,7 @@ func (p *MockProducer) SendMessages(msgs []*sarama.ProducerMessage) error {
 	return nil
 }
 
-func (p *MockProducer) Close() error {
+func (*MockProducer) Close() error {
 	return nil
 }
 

plugins/outputs/kinesis/kinesis.go

@@ -81,7 +81,7 @@ func (k *KinesisOutput) Connect() error {
 	return err
 }
 
-func (k *KinesisOutput) Close() error {
+func (*KinesisOutput) Close() error {
 	return nil
 }
 

plugins/outputs/librato/librato.go

@@ -243,7 +243,7 @@ func (g *Gauge) setValue(v interface{}) error {
 }
 
 // Close is used to close the connection to librato Output
-func (l *Librato) Close() error {
+func (*Librato) Close() error {
 	return nil
 }
 

plugins/outputs/logzio/logzio.go

@@ -94,7 +94,7 @@ func (l *Logzio) Write(metrics []telegraf.Metric) error {
 	var buff bytes.Buffer
 	gz := gzip.NewWriter(&buff)
 	for _, metric := range metrics {
-		m := l.parseMetric(metric)
+		m := parseMetric(metric)
 
 		serialized, err := json.Marshal(m)
 		if err != nil {
@@ -151,7 +151,7 @@ func (l *Logzio) authURL() (string, error) {
 	return fmt.Sprintf("%s/?token=%s", l.URL, token.TemporaryString()), nil
 }
 
-func (l *Logzio) parseMetric(metric telegraf.Metric) *Metric {
+func parseMetric(metric telegraf.Metric) *Metric {
 	return &Metric{
 		Metric: map[string]interface{}{
 			metric.Name(): metric.Fields(),

plugins/outputs/logzio/logzio_test.go

@@ -43,9 +43,8 @@ func TestConnectWithDefaultToken(t *testing.T) {
 }
 
 func TestParseMetric(t *testing.T) {
-	l := &Logzio{}
 	for _, tm := range testutil.MockMetrics() {
-		lm := l.parseMetric(tm)
+		lm := parseMetric(tm)
 		require.Equal(t, tm.Fields(), lm.Metric[tm.Name()])
 		require.Equal(t, logzioType, lm.Type)
 		require.Equal(t, tm.Tags(), lm.Dimensions)

plugins/outputs/nebius_cloud_monitoring/nebius_cloud_monitoring.go

@@ -111,7 +111,7 @@ func (a *NebiusCloudMonitoring) Init() error {
 // Connect initializes the plugin and validates connectivity
 func (a *NebiusCloudMonitoring) Connect() error {
 	a.Log.Debugf("Getting folder ID in %s", a.metadataFolderURL)
-	body, err := a.getResponseFromMetadata(a.client, a.metadataFolderURL)
+	body, err := getResponseFromMetadata(a.client, a.metadataFolderURL)
 	if err != nil {
 		return err
 	}
@@ -166,7 +166,7 @@ func (a *NebiusCloudMonitoring) Write(metrics []telegraf.Metric) error {
 	return a.send(body)
 }
 
-func (a *NebiusCloudMonitoring) getResponseFromMetadata(c *http.Client, metadataURL string) ([]byte, error) {
+func getResponseFromMetadata(c *http.Client, metadataURL string) ([]byte, error) {
 	req, err := http.NewRequest("GET", metadataURL, nil)
 	if err != nil {
 		return nil, fmt.Errorf("error creating request: %w", err)
@@ -191,7 +191,7 @@ func (a *NebiusCloudMonitoring) getResponseFromMetadata(c *http.Client, metadata
 
 func (a *NebiusCloudMonitoring) getIAMTokenFromMetadata() (string, int, error) {
 	a.Log.Debugf("Getting new IAM token in %s", a.metadataTokenURL)
-	body, err := a.getResponseFromMetadata(a.client, a.metadataTokenURL)
+	body, err := getResponseFromMetadata(a.client, a.metadataTokenURL)
 	if err != nil {
 		return "", 0, err
 	}

plugins/outputs/opentsdb/opentsdb.go

@@ -238,7 +238,7 @@ func FloatToString(inputNum float64) string {
 	return strconv.FormatFloat(inputNum, 'f', 6, 64)
 }
 
-func (o *OpenTSDB) Close() error {
+func (*OpenTSDB) Close() error {
 	return nil
 }
 

plugins/outputs/parquet/parquet.go

@@ -63,7 +63,7 @@ func (p *Parquet) Init() error {
 	return nil
 }
 
-func (p *Parquet) Connect() error {
+func (*Parquet) Connect() error {
 	return nil
 }
 

plugins/outputs/postgresql/postgresql.go

@@ -74,7 +74,7 @@ type Postgresql struct {
 	tagsJSONColumn   utils.Column
 }
 
-func (p *Postgresql) SampleConfig() string {
+func (*Postgresql) SampleConfig() string {
 	return sampleConfig
 }
 
@@ -419,7 +419,7 @@ func (p *Postgresql) writeMetricsFromMeasure(ctx context.Context, db dbh, tableS
 	}
 
 	if p.TagsAsForeignKeys {
-		if err = p.writeTagTable(ctx, db, tableSource); err != nil {
+		if err = writeTagTable(ctx, db, tableSource); err != nil {
 			if p.ForeignTagConstraint {
 				return fmt.Errorf("writing to tag table %q: %w", tableSource.Name()+p.TagTableSuffix, err)
 			}
@@ -437,7 +437,7 @@ func (p *Postgresql) writeMetricsFromMeasure(ctx context.Context, db dbh, tableS
 	return nil
 }
 
-func (p *Postgresql) writeTagTable(ctx context.Context, db dbh, tableSource *TableSource) error {
+func writeTagTable(ctx context.Context, db dbh, tableSource *TableSource) error {
 	ttsrc := NewTagTableSource(tableSource)
 
 	// Check whether we have any tags to insert

plugins/outputs/postgresql/table_manager.go

@@ -193,7 +193,7 @@ func (tm *TableManager) EnsureStructure(
 			col.Name = col.Name[:tm.ColumnNameLenLimit]
 			missingCols[i] = col
 		}
-		if tm.validateColumnName(col.Name) {
+		if validateColumnName(col.Name) {
 			addColumns = append(addColumns, col)
 			continue
 		}
@@ -416,7 +416,7 @@ func (tm *TableManager) validateTableName(name string) bool {
 	return len([]byte(name)) <= maxIdentifierLength
 }
 
-func (tm *TableManager) validateColumnName(name string) bool {
+func validateColumnName(name string) bool {
 	return len([]byte(name)) <= maxIdentifierLength
 }
 

plugins/outputs/postgresql/table_source.go

@@ -325,7 +325,7 @@ func (tsrc *TableSource) Values() ([]interface{}, error) {
 	return tsrc.cursorValues, tsrc.cursorError
 }
 
-func (tsrc *TableSource) Err() error {
+func (*TableSource) Err() error {
 	return nil
 }
 
@@ -431,6 +431,6 @@ func (ttsrc *TagTableSource) UpdateCache() {
 	}
 }
 
-func (ttsrc *TagTableSource) Err() error {
+func (*TagTableSource) Err() error {
 	return nil
 }

plugins/outputs/prometheus_client/prometheus_client.go

@@ -197,7 +197,7 @@ func (p *PrometheusClient) listenTCP(host string) (net.Listener, error) {
 	return net.Listen("tcp", host)
 }
 
-func (p *PrometheusClient) listenVsock(host string) (net.Listener, error) {
+func listenVsock(host string) (net.Listener, error) {
 	_, portStr, err := net.SplitHostPort(host)
 	if err != nil {
 		return nil, err
@@ -219,7 +219,7 @@ func (p *PrometheusClient) listen() (net.Listener, error) {
 	case "", "tcp", "http":
 		return p.listenTCP(u.Host)
 	case "vsock":
-		return p.listenVsock(u.Host)
+		return listenVsock(u.Host)
 	default:
 		return p.listenTCP(u.Host)
 	}

plugins/outputs/prometheus_client/v1/collector.go

@@ -85,7 +85,7 @@ func NewCollector(expire time.Duration, stringsAsLabel, exportTimestamp bool, ty
 	return c
 }
 
-func (c *Collector) Describe(ch chan<- *prometheus.Desc) {
+func (*Collector) Describe(ch chan<- *prometheus.Desc) {
 	prometheus.NewGauge(prometheus.GaugeOpts{Name: "Dummy", Help: "Dummy"}).Describe(ch)
 }
 

plugins/outputs/prometheus_client/v2/collector.go

@@ -56,7 +56,7 @@ func NewCollector(expire time.Duration, stringsAsLabel, exportTimestamp bool, ty
 	}
 }
 
-func (c *Collector) Describe(_ chan<- *prometheus.Desc) {
+func (*Collector) Describe(_ chan<- *prometheus.Desc) {
 	// Sending no descriptor at all marks the Collector as "unchecked",
 	// i.e. no checks will be performed at registration time, and the
 	// Collector may yield any Metric it sees fit in its Collect method.

plugins/outputs/redistimeseries/redistimeseries.go

@@ -65,11 +65,11 @@ func (r *RedisTimeSeries) Close() error {
 	return r.client.Close()
 }
 
-func (r *RedisTimeSeries) Description() string {
+func (*RedisTimeSeries) Description() string {
 	return "Plugin for sending metrics to RedisTimeSeries"
 }
 
-func (r *RedisTimeSeries) SampleConfig() string {
+func (*RedisTimeSeries) SampleConfig() string {
 	return sampleConfig
 }
 func (r *RedisTimeSeries) Write(metrics []telegraf.Metric) error {

plugins/outputs/signalfx/signalfx_test.go

@@ -36,10 +36,10 @@ type errorsink struct {
 	events     []*event.Event
 }
 
-func (e *errorsink) AddDatapoints(_ context.Context, _ []*datapoint.Datapoint) error {
+func (*errorsink) AddDatapoints(context.Context, []*datapoint.Datapoint) error {
 	return errors.New("not sending datapoints")
 }
-func (e *errorsink) AddEvents(_ context.Context, _ []*event.Event) error {
+func (*errorsink) AddEvents(context.Context, []*event.Event) error {
 	return errors.New("not sending events")
 }
 

plugins/outputs/stackdriver/stackdriver.go

@@ -251,7 +251,7 @@ func (s *Stackdriver) sendBatch(batch []telegraf.Metric) error {
 		}
 
 		if m.Type() == telegraf.Histogram {
-			value, err := s.buildHistogram(m)
+			value, err := buildHistogram(m)
 			if err != nil {
 				s.Log.Errorf("Unable to build distribution from metric %s: %s", m, err)
 				continue
@@ -563,7 +563,7 @@ func (s *Stackdriver) getStackdriverTypedValue(value interface{}) (*monitoringpb
 	}
 }
 
-func (s *Stackdriver) buildHistogram(m telegraf.Metric) (*monitoringpb.TypedValue, error) {
+func buildHistogram(m telegraf.Metric) (*monitoringpb.TypedValue, error) {
 	sumInter, ok := m.GetField("sum")
 	if !ok {
 		return nil, errors.New("no sum field present")

plugins/outputs/stackdriver/stackdriver_test.go

@@ -1113,10 +1113,6 @@ func TestGenerateHistogramName(t *testing.T) {
 }
 
 func TestBuildHistogram(t *testing.T) {
-	s := &Stackdriver{
-		MetricNameFormat: "official",
-		Log:              testutil.Logger{},
-	}
 	m := testutil.MustMetric(
 		"http_server_duration",
 		map[string]string{},
@@ -1132,7 +1128,7 @@ func TestBuildHistogram(t *testing.T) {
 		},
 		time.Unix(0, 0),
 	)
-	value, err := s.buildHistogram(m)
+	value, err := buildHistogram(m)
 	require.NoError(t, err)
 
 	dist := value.GetDistributionValue()

plugins/outputs/stomp/stomp.go

@@ -88,7 +88,7 @@ func (q *STOMP) Write(metrics []telegraf.Metric) error {
 	}
 	return nil
 }
-func (q *STOMP) SampleConfig() string {
+func (*STOMP) SampleConfig() string {
 	return sampleConfig
 }
 func (q *STOMP) Close() error {

plugins/outputs/sumologic/sumologic.go

@@ -108,7 +108,7 @@ func (s *SumoLogic) Connect() error {
 	return nil
 }
 
-func (s *SumoLogic) Close() error {
+func (*SumoLogic) Close() error {
 	return nil
 }
 

plugins/outputs/timestream/timestream.go

@@ -199,7 +199,7 @@ func (t *Timestream) Connect() error {
 	return nil
 }
 
-func (t *Timestream) Close() error {
+func (*Timestream) Close() error {
 	return nil
 }
 

plugins/outputs/timestream/timestream_test.go

@@ -43,7 +43,7 @@ type mockTimestreamClient struct {
 	WriteRecordsRequestCount int
 }
 
-func (m *mockTimestreamClient) CreateTable(
+func (*mockTimestreamClient) CreateTable(
 	context.Context,
 	*timestreamwrite.CreateTableInput,
 	...func(*timestreamwrite.Options),
@@ -60,7 +60,7 @@ func (m *mockTimestreamClient) WriteRecords(
 	return nil, nil
 }
 
-func (m *mockTimestreamClient) DescribeDatabase(
+func (*mockTimestreamClient) DescribeDatabase(
 	context.Context,
 	*timestreamwrite.DescribeDatabaseInput,
 	...func(*timestreamwrite.Options),
@@ -530,7 +530,7 @@ type mockTimestreamErrorClient struct {
 	ErrorToReturnOnWriteRecords error
 }
 
-func (m *mockTimestreamErrorClient) CreateTable(
+func (*mockTimestreamErrorClient) CreateTable(
 	context.Context,
 	*timestreamwrite.CreateTableInput,
 	...func(*timestreamwrite.Options),
@@ -546,7 +546,7 @@ func (m *mockTimestreamErrorClient) WriteRecords(
 	return nil, m.ErrorToReturnOnWriteRecords
 }
 
-func (m *mockTimestreamErrorClient) DescribeDatabase(
+func (*mockTimestreamErrorClient) DescribeDatabase(
 	context.Context,
 	*timestreamwrite.DescribeDatabaseInput,
 	...func(*timestreamwrite.Options),

plugins/outputs/warp10/warp10.go

@@ -144,7 +144,7 @@ func (w *Warp10) Write(metrics []telegraf.Metric) error {
 		if w.PrintErrorBody {
 			//nolint:errcheck // err can be ignored since it is just for logging
 			body, _ := io.ReadAll(resp.Body)
-			return errors.New(w.WarpURL + ": " + w.HandleError(string(body), w.MaxStringErrorSize))
+			return errors.New(w.WarpURL + ": " + HandleError(string(body), w.MaxStringErrorSize))
 		}
 
 		if len(resp.Status) < w.MaxStringErrorSize {
@@ -236,7 +236,7 @@ func floatToString(inputNum float64) string {
 }
 
 // Close close
-func (w *Warp10) Close() error {
+func (*Warp10) Close() error {
 	return nil
 }
 
@@ -255,7 +255,7 @@ func init() {
 }
 
 // HandleError read http error body and return a corresponding error
-func (w *Warp10) HandleError(body string, maxStringSize int) string {
+func HandleError(body string, maxStringSize int) string {
 	if body == "" {
 		return "Empty return"
 	}

plugins/outputs/warp10/warp10_test.go

@@ -75,11 +75,6 @@ func TestWriteWarp10EncodedTags(t *testing.T) {
 }
 
 func TestHandleWarp10Error(t *testing.T) {
-	w := Warp10{
-		Prefix:  "unit.test",
-		WarpURL: "http://localhost:8090",
-		Token:   config.NewSecret([]byte("WRITE")),
-	}
 	tests := [...]*ErrorTest{
 		{
 			Message: `
@@ -148,7 +143,7 @@ func TestHandleWarp10Error(t *testing.T) {
 	}
 
 	for _, handledError := range tests {
-		payload := w.HandleError(handledError.Message, 511)
+		payload := HandleError(handledError.Message, 511)
 		require.Exactly(t, handledError.Expected, payload)
 	}
 }

plugins/outputs/websocket/websocket_test.go

@@ -23,11 +23,11 @@ func newTestSerializer() *testSerializer {
 	return &testSerializer{}
 }
 
-func (t testSerializer) Serialize(_ telegraf.Metric) ([]byte, error) {
+func (testSerializer) Serialize(_ telegraf.Metric) ([]byte, error) {
 	return []byte("1"), nil
 }
 
-func (t testSerializer) SerializeBatch(metrics []telegraf.Metric) ([]byte, error) {
+func (testSerializer) SerializeBatch(metrics []telegraf.Metric) ([]byte, error) {
 	return []byte(strconv.Itoa(len(metrics))), nil
 }
 

plugins/outputs/zabbix/zabbix.go

@@ -60,7 +60,7 @@ func (*Zabbix) SampleConfig() string {
 // Connect does nothing, Write() would initiate connection in each call.
 // Checking if Zabbix server is alive in this step does not allow Telegraf
 // to start if there is a temporal connection problem with the server.
-func (z *Zabbix) Connect() error {
+func (*Zabbix) Connect() error {
 	return nil
 }
 
@@ -87,7 +87,7 @@ func (z *Zabbix) Init() error {
 	return nil
 }
 
-func (z *Zabbix) Close() error {
+func (*Zabbix) Close() error {
 	return nil
 }