additional updates

Author: dhtclk

docs/use-cases/observability/clickstack/deployment/hyperdx-clickhouse-cloud.md

@@ -288,16 +288,16 @@ For users looking to explore the HyperDX interface only, we recommend our [sampl
 
 ### User permissions {#user-permissions}
 
-Users accessing HyperDX need **readonly permissions** and **SELECT access** to tables containing observability data.
+Users accessing HyperDX need **readonly SQL console access** and **SELECT permissions** on tables containing observability data.
 
-**Basic setup:**
+#### Basic Setup {#basic-setup}
 ```sql
 -- Grant readonly access and observability table permissions
 GRANT readonly TO your_user;
 GRANT SELECT ON otel.* TO your_user;
 ```
 
-**For ClickHouse infrastructure monitoring:**
+#### For ClickHouse infrastructure monitoring {#infra-monitoring}
 
 To use the built-in ClickHouse monitoring dashboard, grant additional system table permissions:
 
@@ -324,6 +324,10 @@ GRANT SHOW COLUMNS, SELECT(event_date, event_time, hostname, metric, value)
 HyperDX uses the user's SQL console permissions to query data. For custom schemas, grant SELECT on the specific tables users need to access.
 :::
 
+:::important Alerts require admin access
+To enable alerts, **at least one user with admin access** to the database via the SQL console must log into HyperDX at least once. This is required to provision a dedicated user in the database that runs alert queries.
+:::
+
 ### Create a data source {#create-a-datasource}
 
 HyperDX is Open Telemetry native but not Open Telemetry exclusive - users can use their own table schemas if desired.