test(lint): Fix lint warnings

go.mod

@@ -4,7 +4,6 @@ go 1.22.2
 
 require (
 	github.com/aws/aws-lambda-go v1.47.0
-	github.com/davecgh/go-spew v1.1.1
 	github.com/slack-go/slack v0.12.5
 	github.com/spf13/cobra v1.8.0
 	github.com/spf13/pflag v1.0.5
@@ -13,6 +12,7 @@ require (
 )
 
 require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/gorilla/websocket v1.4.2 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/kr/pretty v0.3.0 // indirect

internal/alert/slack.go

@@ -19,6 +19,7 @@ func (event Event) ContextMsg() string {
 
 	switch event.AlarmData.State.Value {
 	case StateAlarm, StateInsufficientData:
+		//nolint:gosmopolitan
 		context += "\n*Started at:* _" + event.AlarmData.State.Timestamp.Local().Format("3:04:05 PM") + "_"
 	case StateOK:
 		context += "\n*Duration:* " + event.AlarmData.State.Timestamp.Sub(event.AlarmData.PreviousState.Timestamp.Time).Round(time.Second).String()

internal/alert/time.go

@@ -2,6 +2,7 @@ package alert
 
 import (
 	"errors"
+	"fmt"
 	"time"
 )
 
@@ -11,9 +12,11 @@ type Time struct {
 	time.Time
 }
 
+var ErrTimeInvalidInput = errors.New("Time.UnmarshalJSON: input is not JSON")
+
 func (t *Time) UnmarshalJSON(data []byte) error {
 	if len(data) < 2 || data[0] != '"' || data[len(data)-1] != '"' {
-		return errors.New("Time.UnmarshalJSON: input is not a JSON string")
+		return fmt.Errorf("%w: %q", ErrTimeInvalidInput, data)
 	}
 	data = data[len(`"`) : len(data)-len(`"`)]
 	var err error