docs: add validation methods for Grafana provider when Keep is not ac…

…cessible externally (#1634)

docs/providers/documentation/grafana-provider.mdx

@@ -41,38 +41,59 @@ To connect to Grafana, you need to create an API Token:
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-6. Use the token value to the `authentication` section in the Grafana Provider configuration.
+6. Use the token value in the `authentication` section in the Grafana Provider configuration.
 
-## Post installation validation
+## Post Installation Validation
 
-You can check that the Grafana Provider works by testing Keep's contact point (which installed via the webhook integration).
-1. Go to Contact Points (cmd k -> contact)
-2. Find the keep-grafana-webhook-integration:
+You can check that the Grafana Provider works by testing Keep's contact point (which was installed via the webhook integration).
+
+1. Go to **Contact Points** (cmd k -> contact).
+2. Find the **keep-grafana-webhook-integration**:
 
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-3. Click on the "View contact point":
+3. Click on the **View contact point**:
 
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-4. Click on "Test":
+4. Click on **Test**:
 
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-5. Go to Keep - you should see an alert from Grafana!
+5. Go to Keep – you should see an alert from Grafana!
+
+**Alternative Validation Methods (When Keep is Not Accessible Externally):**
+
+If Keep is not accessible externally and the webhook cannot be created, you can manually validate the Grafana provider setup using the following methods:
+
+1. **Manual Test Alerts in Grafana:**
+ - Create a manual test alert in Grafana.
+ - Set up a contact point within Grafana that would normally send alerts to Keep.
+ - Trigger the alert and check Grafana's logs for errors or confirmation that the alert was sent.
+
+2. **Check Logs in Grafana:**
+ - Access Grafana’s log files or use the **Explore** feature to query logs related to the alerting mechanism.
+ - Ensure there are no errors related to the webhook integration and that alerts are processed correctly.
+
+3. **Verify Integration Status:**
+ - Navigate to the **Alerting** section in Grafana.
+ - Confirm that the integration status shows as active or functioning.
+ - Monitor any outbound HTTP requests to verify that Grafana is attempting to communicate with Keep.
+
+4. **Network and Connectivity Check:**
+ - Use network monitoring tools to ensure Grafana can reach Keep or any alternative endpoint configured for alerts.
 
 ## Webhook Integration Modifications
 
-The webhook integration adds Keep as a contact point in the Grafana instance. This integration can be located under the "Contact Points" section.
-Keep also gains access to the following scopes:
+The webhook integration adds Keep as a contact point in the Grafana instance. This integration can be located under the "Contact Points" section. Keep also gains access to the following scopes:
 - `alert.provisioning:read`
 - `alert.provisioning:write`