feat: support Google Chat as an Alert notification provider

README.md

@@ -189,7 +189,7 @@ metadata:
 
 Reloader can optionally **send alerts** whenever it triggers a rolling upgrade for a workload (e.g., `Deployment`, `StatefulSet`, etc.).
 
-These alerts are sent to a configured **webhook endpoint**, which can be a generic receiver or services like Slack or Microsoft Teams.
+These alerts are sent to a configured **webhook endpoint**, which can be a generic receiver or services like Slack, Microsoft Teams or Google Chat.
 
 To enable this feature, update the `reloader.env.secret` section in your `values.yaml` (when installing via Helm):
 
@@ -198,7 +198,7 @@ reloader:
   env:
     secret:
       ALERT_ON_RELOAD: "true"                    # Enable alerting (default: false)
-      ALERT_SINK: "slack"                        # Options: slack, teams, webhook (default: webhook)
+      ALERT_SINK: "slack"                        # Options: slack, teams, gchat or webhook (default: webhook)
       ALERT_WEBHOOK_URL: "<your-webhook-url>"    # Required if ALERT_ON_RELOAD is true
       ALERT_ADDITIONAL_INFO: "Triggered by Reloader in staging environment"
 ```

docs/Alerting.md

@@ -8,7 +8,7 @@ In-order to enable this feature, you need to update the `reloader.env.secret` se
 
 ```yaml
       ALERT_ON_RELOAD: [ true/false ] Default: false
-      ALERT_SINK: [ slack/teams/webhook ] Default: webhook
+      ALERT_SINK: [ slack/teams/gchat/webhook ] Default: webhook
       ALERT_WEBHOOK_URL: Required if ALERT_ON_RELOAD is true
       ALERT_ADDITIONAL_INFO: Any additional information to be added to alert
 ```

internal/pkg/alerts/alert.go

@@ -35,6 +35,8 @@ func SendWebhookAlert(msg string) {
 		sendSlackAlert(webhook_url, webhook_proxy, msg)
 	} else if alert_sink == "teams" {
 		sendTeamsAlert(webhook_url, webhook_proxy, msg)
+	} else if alert_sink == "gchat" {
+		sendGoogleChatAlert(webhook_url, webhook_proxy, msg)
 	} else {
 		msg = strings.Replace(msg, "*", "", -1)
 		sendRawWebhookAlert(webhook_url, webhook_proxy, msg)
@@ -98,6 +100,29 @@ func sendTeamsAlert(webhookUrl string, proxy string, msg string) []error {
 	return nil
 }
 
+// function to send alert to Google Chat webhook
+func sendGoogleChatAlert(webhookUrl string, proxy string, msg string) []error {
+	payload := map[string]interface{}{
+		"text": msg,
+	}
+
+	request := gorequest.New().Proxy(proxy)
+	resp, _, err := request.
+		Post(webhookUrl).
+		RedirectPolicy(redirectPolicy).
+		Send(payload).
+		End()
+
+	if err != nil {
+		return err
+	}
+	if resp.StatusCode != 200 {
+		return []error{fmt.Errorf("error sending msg. status: %v", resp.Status)}
+	}
+
+	return nil
+}
+
 // function to send alert to webhook service as text
 func sendRawWebhookAlert(webhookUrl string, proxy string, msg string) []error {
 	request := gorequest.New().Proxy(proxy)