Fix some minor code style issues

 - Unsused variables and unsused fmt methods

Author: martialblog

cmd/alert.go

@@ -39,7 +39,7 @@ inactive = 0`,
 	 \_[OK] [PrometheusTargetMissing] is inactive
 	 \_[CRITICAL] [PrometheusAlertmanagerJobMissing] - Job: [alertmanager] is firing - value: 1.00
 	 | total=2 firing=1 pending=0 inactive=1`,
-	Run: func(cmd *cobra.Command, args []string) {
+	Run: func(_ *cobra.Command, _ []string) {
 		var (
 			counterFiring   int
 			counterPending  int

cmd/config.go

@@ -2,7 +2,7 @@ package cmd
 
 import (
 	"context"
-	"fmt"
+	"errors"
 	"net"
 	"net/http"
 	"net/url"
@@ -103,7 +103,7 @@ func (c *Config) NewClient() *client.Client {
 	if c.BasicAuth != "" {
 		s := strings.Split(c.BasicAuth, ":")
 		if len(s) != 2 {
-			check.ExitError(fmt.Errorf("specify the user name and password for server authentication <user:password>"))
+			check.ExitError(errors.New("specify the user name and password for server authentication <user:password>"))
 		}
 
 		var u = config.NewInlineSecret(s[0])

cmd/health.go

@@ -1,7 +1,7 @@
 package cmd
 
 import (
-	"fmt"
+	"errors"
 
 	"github.com/NETWAYS/go-check"
 	"github.com/NETWAYS/go-check/result"
@@ -20,7 +20,7 @@ Ready: Checks the readiness of an endpoint, which returns OK if the Prometheus s
 
 	$ check_prometheus --bearer secrettoken health --ready
 	OK - Prometheus Server is Ready. | statuscode=200`,
-	Run: func(cmd *cobra.Command, args []string) {
+	Run: func(_ *cobra.Command, _ []string) {
 		var (
 			rc int
 		)
@@ -43,7 +43,7 @@ Ready: Checks the readiness of an endpoint, which returns OK if the Prometheus s
 			rc, _, output, err := c.GetStatus(ctx, "ready")
 
 			if err != nil {
-				check.ExitError(fmt.Errorf(output))
+				check.ExitError(errors.New(output))
 			}
 
 			partialResult := result.NewPartialResult()
@@ -81,7 +81,7 @@ Ready: Checks the readiness of an endpoint, which returns OK if the Prometheus s
 		rc, _, output, err := c.GetStatus(ctx, "healthy")
 
 		if err != nil {
-			check.ExitError(fmt.Errorf(output))
+			check.ExitError(errors.New(output))
 		}
 
 		partialResult := result.NewPartialResult()

cmd/query.go

@@ -1,6 +1,7 @@
 package cmd
 
 import (
+	"errors"
 	"fmt"
 	"math"
 	"strconv"
@@ -61,12 +62,12 @@ Note: Time range values e.G. 'go_memstats_alloc_bytes_total[0s]' only the latest
 	 \_[OK] go_gc_duration_seconds_count{instance="localhost:9090", job="prometheus"} - value: 1599
 	 \_[CRITICAL] go_gc_duration_seconds_count{instance="node-exporter:9100", job="node-exporter"} - value: 79610
 	 | value_go_gc_duration_seconds_count_localhost:9090_prometheus=1599 value_go_gc_duration_seconds_count_node-exporter:9100_node-exporter=79610`,
-	PreRun: func(cmd *cobra.Command, args []string) {
+	PreRun: func(_ *cobra.Command, _ []string) {
 		if cliQueryConfig.Warning == "" || cliQueryConfig.Critical == "" {
-			check.ExitError(fmt.Errorf("please specify warning and critical thresholds"))
+			check.ExitError(errors.New("please specify warning and critical thresholds"))
 		}
 	},
-	Run: func(cmd *cobra.Command, args []string) {
+	Run: func(_ *cobra.Command, _ []string) {
 		crit, err := check.ParseThreshold(cliQueryConfig.Critical)
 		if err != nil {
 			check.ExitError(err)
@@ -90,7 +91,7 @@ Note: Time range values e.G. 'go_memstats_alloc_bytes_total[0s]' only the latest
 
 		if err != nil {
 			if strings.Contains(err.Error(), "unmarshalerDecoder: unexpected value type \"string\"") {
-				err = fmt.Errorf("string value results are not supported")
+				err = errors.New("string value results are not supported")
 			}
 			check.ExitError(err)
 		}
@@ -99,15 +100,15 @@ Note: Time range values e.G. 'go_memstats_alloc_bytes_total[0s]' only the latest
 
 		switch result.Type() {
 		default:
-			check.ExitError(fmt.Errorf("none value results are not supported"))
+			check.ExitError(errors.New("none value results are not supported"))
 		// Scalar - a simple numeric floating point value
 		case model.ValScalar:
-			check.ExitError(fmt.Errorf("scalar value results are not supported"))
+			check.ExitError(errors.New("scalar value results are not supported"))
 		case model.ValNone:
-			check.ExitError(fmt.Errorf("none value results are not supported"))
+			check.ExitError(errors.New("none value results are not supported"))
 		case model.ValString:
 			// String - a simple string value; currently unused
-			check.ExitError(fmt.Errorf("string value results are not supported"))
+			check.ExitError(errors.New("string value results are not supported"))
 		case model.ValVector:
 			// Instant vector - a set of time series containing a single sample for each time series, all sharing the same timestamp
 			vectorVal := result.(model.Vector)

cmd/root.go

@@ -12,7 +12,7 @@ var Timeout = 30
 var rootCmd = &cobra.Command{
 	Use:   "check_prometheus",
 	Short: "An Icinga check plugin to check Prometheus",
-	PersistentPreRun: func(cmd *cobra.Command, args []string) {
+	PersistentPreRun: func(_ *cobra.Command, _ []string) {
 		go check.HandleTimeout(Timeout)
 	},
 	Run: Usage,