chore: Fix linter findings for revive:unused-receiver in plugins/inputs/[s-z]

plugins/inputs/sflow/packetdecoder.go

@@ -372,9 +372,9 @@ func (d *packetDecoder) decodeIPv4Header(r io.Reader) (h ipV4Header, err error)
 	}
 	switch h.Protocol {
 	case ipProtocolTCP:
-		h.ProtocolHeader, err = d.decodeTCPHeader(r)
+		h.ProtocolHeader, err = decodeTCPHeader(r)
 	case ipProtocolUDP:
-		h.ProtocolHeader, err = d.decodeUDPHeader(r)
+		h.ProtocolHeader, err = decodeUDPHeader(r)
 	default:
 		d.debug("Unknown IP protocol: ", h.Protocol)
 	}
@@ -412,9 +412,9 @@ func (d *packetDecoder) decodeIPv6Header(r io.Reader) (h ipV6Header, err error)
 	}
 	switch h.NextHeaderProto {
 	case ipProtocolTCP:
-		h.ProtocolHeader, err = d.decodeTCPHeader(r)
+		h.ProtocolHeader, err = decodeTCPHeader(r)
 	case ipProtocolUDP:
-		h.ProtocolHeader, err = d.decodeUDPHeader(r)
+		h.ProtocolHeader, err = decodeUDPHeader(r)
 	default:
 		// not handled
 		d.debug("Unknown IP protocol: ", h.NextHeaderProto)
@@ -423,7 +423,7 @@ func (d *packetDecoder) decodeIPv6Header(r io.Reader) (h ipV6Header, err error)
 }
 
 // https://en.wikipedia.org/wiki/Transmission_Control_Protocol#TCP_segment_structure
-func (d *packetDecoder) decodeTCPHeader(r io.Reader) (h tcpHeader, err error) {
+func decodeTCPHeader(r io.Reader) (h tcpHeader, err error) {
 	if err := read(r, &h.SourcePort, "SourcePort"); err != nil {
 		return h, err
 	}
@@ -461,7 +461,7 @@ func (d *packetDecoder) decodeTCPHeader(r io.Reader) (h tcpHeader, err error) {
 	return h, err
 }
 
-func (d *packetDecoder) decodeUDPHeader(r io.Reader) (h udpHeader, err error) {
+func decodeUDPHeader(r io.Reader) (h udpHeader, err error) {
 	if err := read(r, &h.SourcePort, "SourcePort"); err != nil {
 		return h, err
 	}

plugins/inputs/sflow/packetdecoder_test.go

@@ -15,8 +15,7 @@ func TestUDPHeader(t *testing.T) {
 		0x00, 0x00, // checksum
 	})
 
-	dc := newDecoder()
-	actual, err := dc.decodeUDPHeader(octets)
+	actual, err := decodeUDPHeader(octets)
 	require.NoError(t, err)
 
 	expected := udpHeader{
@@ -36,11 +35,9 @@ func BenchmarkUDPHeader(b *testing.B) {
 		0x00, 0x00, // checksum
 	})
 
-	dc := newDecoder()
-
 	b.ResetTimer()
 	for n := 0; n < b.N; n++ {
-		_, err := dc.decodeUDPHeader(octets)
+		_, err := decodeUDPHeader(octets)
 		require.NoError(b, err)
 	}
 }

plugins/inputs/sflow/sflow.go

@@ -84,7 +84,7 @@ func (s *SFlow) Start(acc telegraf.Accumulator) error {
 }
 
 // Gather is a NOOP for sFlow as it receives, asynchronously, sFlow network packets
-func (s *SFlow) Gather(_ telegraf.Accumulator) error {
+func (*SFlow) Gather(telegraf.Accumulator) error {
 	return nil
 }
 

plugins/inputs/slab/slab.go

@@ -35,10 +35,6 @@ func (*SlabStats) SampleConfig() string {
 	return sampleConfig
 }
 
-func (ss *SlabStats) Init() error {
-	return nil
-}
-
 func (ss *SlabStats) Gather(acc telegraf.Accumulator) error {
 	fields, err := ss.getSlabStats()
 	if err != nil {

plugins/inputs/slurm/slurm.go

@@ -103,7 +103,7 @@ func (s *Slurm) Init() error {
 	return nil
 }
 
-func (s *Slurm) parseTres(tres string) map[string]interface{} {
+func parseTres(tres string) map[string]interface{} {
 	tresKVs := strings.Split(tres, ",")
 	parsedValues := make(map[string]interface{}, len(tresKVs))
 
@@ -258,7 +258,7 @@ func (s *Slurm) gatherJobsMetrics(acc telegraf.Accumulator, jobs []goslurm.V0038
 			records["time_limit"] = *int64Ptr
 		}
 		if strPtr, ok := jobs[i].GetTresReqStrOk(); ok {
-			for k, v := range s.parseTres(*strPtr) {
+			for k, v := range parseTres(*strPtr) {
 				records["tres_"+k] = v
 			}
 		}
@@ -302,12 +302,12 @@ func (s *Slurm) gatherNodesMetrics(acc telegraf.Accumulator, nodes []goslurm.V00
 			records["alloc_memory"] = *int64Ptr
 		}
 		if strPtr, ok := node.GetTresOk(); ok {
-			for k, v := range s.parseTres(*strPtr) {
+			for k, v := range parseTres(*strPtr) {
 				records["tres_"+k] = v
 			}
 		}
 		if strPtr, ok := node.GetTresUsedOk(); ok {
-			for k, v := range s.parseTres(*strPtr) {
+			for k, v := range parseTres(*strPtr) {
 				records["tres_used_"+k] = v
 			}
 		}
@@ -348,7 +348,7 @@ func (s *Slurm) gatherPartitionsMetrics(acc telegraf.Accumulator, partitions []g
 			records["nodes"] = *strPtr
 		}
 		if strPtr, ok := partition.GetTresOk(); ok {
-			for k, v := range s.parseTres(*strPtr) {
+			for k, v := range parseTres(*strPtr) {
 				records["tres_"+k] = v
 			}
 		}

plugins/inputs/snmp/snmp_test.go

@@ -56,7 +56,7 @@ func (tsc *testSNMPConnection) Walk(oid string, wf gosnmp.WalkFunc) error {
 	}
 	return nil
 }
-func (tsc *testSNMPConnection) Reconnect() error {
+func (*testSNMPConnection) Reconnect() error {
 	return nil
 }
 

plugins/inputs/snmp_trap/gosmi.go

@@ -8,7 +8,7 @@ import (
 type gosmiTranslator struct {
 }
 
-func (t *gosmiTranslator) lookup(oid string) (snmp.MibEntry, error) {
+func (*gosmiTranslator) lookup(oid string) (snmp.MibEntry, error) {
 	return snmp.TrapLookup(oid)
 }
 

plugins/inputs/snmp_trap/snmp_trap.go

@@ -75,7 +75,7 @@ func (*SnmpTrap) SampleConfig() string {
 	return sampleConfig
 }
 
-func (s *SnmpTrap) Gather(_ telegraf.Accumulator) error {
+func (*SnmpTrap) Gather(telegraf.Accumulator) error {
 	return nil
 }
 

plugins/inputs/socket_listener/socket_listener.go

@@ -44,7 +44,7 @@ func (sl *SocketListener) Init() error {
 	return nil
 }
 
-func (sl *SocketListener) Gather(_ telegraf.Accumulator) error {
+func (*SocketListener) Gather(telegraf.Accumulator) error {
 	return nil
 }
 

plugins/inputs/solr/solr.go

@@ -68,7 +68,7 @@ func (s *Solr) Start(_ telegraf.Accumulator) error {
 	return nil
 }
 
-func (s *Solr) Stop() {}
+func (*Solr) Stop() {}
 
 func (s *Solr) Gather(acc telegraf.Accumulator) error {
 	var wg sync.WaitGroup

plugins/inputs/sqlserver/sqlserver.go

@@ -232,7 +232,7 @@ func (s *SQLServer) Gather(acc telegraf.Accumulator) error {
 
 				if s.HealthMetric {
 					mutex.Lock()
-					s.gatherHealth(healthMetrics, dsn, queryError)
+					gatherHealth(healthMetrics, dsn, queryError)
 					mutex.Unlock()
 				}
 
@@ -425,7 +425,7 @@ func (s *SQLServer) accRow(query Query, acc telegraf.Accumulator, row scanner) e
 }
 
 // gatherHealth stores info about any query errors in the healthMetrics map
-func (s *SQLServer) gatherHealth(healthMetrics map[string]*HealthMetric, serv string, queryError error) {
+func gatherHealth(healthMetrics map[string]*HealthMetric, serv string, queryError error) {
 	if healthMetrics[serv] == nil {
 		healthMetrics[serv] = &HealthMetric{}
 	}

plugins/inputs/stackdriver/stackdriver.go

@@ -572,7 +572,7 @@ func (s *stackdriver) gatherTimeSeries(
 
 			if tsDesc.ValueType == metricpb.MetricDescriptor_DISTRIBUTION {
 				dist := p.Value.GetDistributionValue()
-				if err := s.addDistribution(dist, tags, ts, grouper, tsConf); err != nil {
+				if err := addDistribution(dist, tags, ts, grouper, tsConf); err != nil {
 					return err
 				}
 			} else {
@@ -666,10 +666,8 @@ func NewBucket(dist *distributionpb.Distribution) (buckets, error) {
 	return nil, errors.New("no buckets available")
 }
 
-// AddDistribution adds metrics from a distribution value type.
-func (s *stackdriver) addDistribution(dist *distributionpb.Distribution, tags map[string]string, ts time.Time,
-	grouper *lockedSeriesGrouper, tsConf *timeSeriesConf,
-) error {
+// addDistribution adds metrics from a distribution value type.
+func addDistribution(dist *distributionpb.Distribution, tags map[string]string, ts time.Time, grouper *lockedSeriesGrouper, tsConf *timeSeriesConf) error {
 	field := tsConf.fieldKey
 	name := tsConf.measurement
 

plugins/inputs/supervisor/supervisor.go

@@ -49,11 +49,7 @@ type supervisorInfo struct {
 //go:embed sample.conf
 var sampleConfig string
 
-func (s *Supervisor) Description() string {
-	return "Gather info about processes state, that running under supervisor using its XML-RPC API"
-}
-
-func (s *Supervisor) SampleConfig() string {
+func (*Supervisor) SampleConfig() string {
 	return sampleConfig
 }
 

plugins/inputs/suricata/suricata.go

@@ -344,7 +344,7 @@ func (s *Suricata) parse(acc telegraf.Accumulator, sjson []byte) error {
 
 // Gather measures and submits one full set of telemetry to Telegraf.
 // Not used here, submission is completely input-driven.
-func (s *Suricata) Gather(_ telegraf.Accumulator) error {
+func (*Suricata) Gather(telegraf.Accumulator) error {
 	return nil
 }
 

plugins/inputs/sysstat/sysstat.go

@@ -199,7 +199,7 @@ func withCLocale(cmd *exec.Cmd) *exec.Cmd {
 //
 // and parses the output to add it to the telegraf.Accumulator acc.
 func (s *Sysstat) parse(acc telegraf.Accumulator, option, tmpfile string, ts time.Time) error {
-	cmd := execCommand(s.Sadf, s.sadfOptions(option, tmpfile)...)
+	cmd := execCommand(s.Sadf, sadfOptions(option, tmpfile)...)
 	cmd = withCLocale(cmd)
 	stdout, err := cmd.StdoutPipe()
 	if err != nil {
@@ -282,7 +282,7 @@ func (s *Sysstat) parse(acc telegraf.Accumulator, option, tmpfile string, ts tim
 }
 
 // sadfOptions creates the correct options for the sadf utility.
-func (s *Sysstat) sadfOptions(activityOption, tmpfile string) []string {
+func sadfOptions(activityOption, tmpfile string) []string {
 	options := []string{
 		"-p",
 		"--",

plugins/inputs/system/ps.go

@@ -45,7 +45,7 @@ type SystemPS struct {
 
 type SystemPSDisk struct{}
 
-func (s *SystemPS) CPUTimes(perCPU, totalCPU bool) ([]cpu.TimesStat, error) {
+func (*SystemPS) CPUTimes(perCPU, totalCPU bool) ([]cpu.TimesStat, error) {
 	var cpuTimes []cpu.TimesStat
 	if perCPU {
 		perCPUTimes, err := cpu.Times(true)
@@ -175,23 +175,23 @@ partitionRange:
 	return usage, partitions, nil
 }
 
-func (s *SystemPS) NetProto() ([]net.ProtoCountersStat, error) {
+func (*SystemPS) NetProto() ([]net.ProtoCountersStat, error) {
 	return net.ProtoCounters(nil)
 }
 
-func (s *SystemPS) NetIO() ([]net.IOCountersStat, error) {
+func (*SystemPS) NetIO() ([]net.IOCountersStat, error) {
 	return net.IOCounters(true)
 }
 
-func (s *SystemPS) NetConnections() ([]net.ConnectionStat, error) {
+func (*SystemPS) NetConnections() ([]net.ConnectionStat, error) {
 	return net.Connections("all")
 }
 
-func (s *SystemPS) NetConntrack(perCPU bool) ([]net.ConntrackStat, error) {
+func (*SystemPS) NetConntrack(perCPU bool) ([]net.ConntrackStat, error) {
 	return net.ConntrackStats(perCPU)
 }
 
-func (s *SystemPS) DiskIO(names []string) (map[string]disk.IOCountersStat, error) {
+func (*SystemPS) DiskIO(names []string) (map[string]disk.IOCountersStat, error) {
 	m, err := disk.IOCounters(names...)
 	if errors.Is(err, internal.ErrNotImplemented) {
 		return nil, nil
@@ -200,26 +200,26 @@ func (s *SystemPS) DiskIO(names []string) (map[string]disk.IOCountersStat, error
 	return m, err
 }
 
-func (s *SystemPS) VMStat() (*mem.VirtualMemoryStat, error) {
+func (*SystemPS) VMStat() (*mem.VirtualMemoryStat, error) {
 	return mem.VirtualMemory()
 }
 
-func (s *SystemPS) SwapStat() (*mem.SwapMemoryStat, error) {
+func (*SystemPS) SwapStat() (*mem.SwapMemoryStat, error) {
 	return mem.SwapMemory()
 }
 
-func (s *SystemPSDisk) Partitions(all bool) ([]disk.PartitionStat, error) {
+func (*SystemPSDisk) Partitions(all bool) ([]disk.PartitionStat, error) {
 	return disk.Partitions(all)
 }
 
-func (s *SystemPSDisk) OSGetenv(key string) string {
+func (*SystemPSDisk) OSGetenv(key string) string {
 	return os.Getenv(key)
 }
 
-func (s *SystemPSDisk) OSStat(name string) (os.FileInfo, error) {
+func (*SystemPSDisk) OSStat(name string) (os.FileInfo, error) {
 	return os.Stat(name)
 }
 
-func (s *SystemPSDisk) PSDiskUsage(path string) (*disk.UsageStat, error) {
+func (*SystemPSDisk) PSDiskUsage(path string) (*disk.UsageStat, error) {
 	return disk.Usage(path)
 }

plugins/inputs/tacacs/tacacs.go

@@ -34,7 +34,7 @@ type Tacacs struct {
 //go:embed sample.conf
 var sampleConfig string
 
-func (t *Tacacs) SampleConfig() string {
+func (*Tacacs) SampleConfig() string {
 	return sampleConfig
 }
 
@@ -74,7 +74,7 @@ func (t *Tacacs) Init() error {
 	return nil
 }
 
-func (t *Tacacs) AuthenReplyToString(code uint8) string {
+func AuthenReplyToString(code uint8) string {
 	switch code {
 	case tacplus.AuthenStatusPass:
 		return `AuthenStatusPass`
@@ -157,7 +157,7 @@ func (t *Tacacs) pollServer(acc telegraf.Accumulator, client *tacplus.Client) er
 	defer session.Close()
 	if reply.Status != tacplus.AuthenStatusGetUser {
 		fields["responsetime_ms"] = time.Since(startTime).Milliseconds()
-		fields["response_status"] = t.AuthenReplyToString(reply.Status)
+		fields["response_status"] = AuthenReplyToString(reply.Status)
 		acc.AddFields("tacacs", fields, tags)
 		return nil
 	}
@@ -174,7 +174,7 @@ func (t *Tacacs) pollServer(acc telegraf.Accumulator, client *tacplus.Client) er
 	}
 	if reply.Status != tacplus.AuthenStatusGetPass {
 		fields["responsetime_ms"] = time.Since(startTime).Milliseconds()
-		fields["response_status"] = t.AuthenReplyToString(reply.Status)
+		fields["response_status"] = AuthenReplyToString(reply.Status)
 		acc.AddFields("tacacs", fields, tags)
 		return nil
 	}
@@ -191,13 +191,13 @@ func (t *Tacacs) pollServer(acc telegraf.Accumulator, client *tacplus.Client) er
 	}
 	if reply.Status != tacplus.AuthenStatusPass {
 		fields["responsetime_ms"] = time.Since(startTime).Milliseconds()
-		fields["response_status"] = t.AuthenReplyToString(reply.Status)
+		fields["response_status"] = AuthenReplyToString(reply.Status)
 		acc.AddFields("tacacs", fields, tags)
 		return nil
 	}
 
 	fields["responsetime_ms"] = time.Since(startTime).Milliseconds()
-	fields["response_status"] = t.AuthenReplyToString(reply.Status)
+	fields["response_status"] = AuthenReplyToString(reply.Status)
 	acc.AddFields("tacacs", fields, tags)
 	return nil
 }

plugins/inputs/tail/multiline.go

@@ -109,7 +109,7 @@ func (m *Multiline) ProcessLine(text string, buffer *bytes.Buffer) string {
 	return text
 }
 
-func (m *Multiline) Flush(buffer *bytes.Buffer) string {
+func Flush(buffer *bytes.Buffer) string {
 	if buffer.Len() == 0 {
 		return ""
 	}