Fix linting issues

.golangci.yaml

@@ -98,6 +98,11 @@ linters-settings:
   stylecheck:
     checks: [all]
 
+  tagliatelle:
+    case:
+      rules:
+        json: goCamel
+
   wrapcheck:
     ignoreSigs:
       - .Errorf(

pkg/alertmanager/message.go

@@ -20,15 +20,15 @@ const (
 
 // Message represents a message received from Alertmanager via webhook.
 type Message struct {
-	Version           string
-	GroupKey          string
-	Status            string
-	Receiver          string
-	GroupLabels       map[string]string
-	CommonLabels      map[string]string
-	CommonAnnotations map[string]string
-	ExternalURL       string
-	Alerts            []*Alert
+	Version           string            `json:"version"`
+	GroupKey          string            `json:"groupKey"`
+	Status            string            `json:"status"`
+	Receiver          string            `json:"receiver"`
+	GroupLabels       map[string]string `json:"groupLabels"`
+	CommonLabels      map[string]string `json:"commonLabels"`
+	CommonAnnotations map[string]string `json:"commonAnnotations"`
+	ExternalURL       string            `json:"externalURL"`
+	Alerts            []*Alert          `json:"alerts"`
 }
 
 // Alert represents an Alert received from Alertmanager via webhook.

pkg/bot/matrix.go

@@ -52,7 +52,7 @@ func NewClient(config *ClientConfig, formatter *Formatter) (client *Client, err
 	// Create Alertmanager client
 	client.Alertmanager, err = alertmanager.NewClient(config.AlertManagerURL)
 	if err != nil {
-		return
+		return nil, fmt.Errorf("error creating Alertmanager client: %w", err)
 	}
 
 	// Matrix bot config
@@ -65,7 +65,7 @@ func NewClient(config *ClientConfig, formatter *Formatter) (client *Client, err
 	// Create Matrix client
 	client.Matrix, err = bot.NewClient(config.Homeserver, config.UserID, config.Token, matrixConfig)
 	if err != nil {
-		return
+		return nil, fmt.Errorf("error creating Matrix client: %w", err)
 	}
 
 	// Create room list
@@ -78,7 +78,7 @@ func NewClient(config *ClientConfig, formatter *Formatter) (client *Client, err
 	client.Matrix.SetCommand("list", client.listCommand())
 	client.Matrix.SetCommand("silence", client.silenceCommand())
 
-	return
+	return client, nil
 }
 
 // mainCommand returns the `alert` bot command.