Azure raw data should be string not dict

webhooks/azuremonitor/alerta_azuremonitor.py

@@ -1,3 +1,5 @@
+import json
+
 from dateutil.parser import parse as parse_date
 
 from alerta.models.alert import Alert
@@ -111,5 +113,5 @@ class AzureMonitorWebhook(WebhookBase):
             origin='Azure Monitor',
             type=event_type,
             create_time=create_time,
-            raw_data=payload
+            raw_data=json.dumps(payload)
         )

webhooks/azuremonitor/setup.py

@@ -1,6 +1,6 @@
 from setuptools import setup, find_packages
 
-version = '5.0.1'
+version = '5.0.2'
 
 setup(
     name="alerta-azure-monitor",