Update advisor-reference-reliability-recommendations.md

removed "for Redis" from the "Cache" section title and added two new recommendations to the "CDN" section

Author: mabrahms

articles/advisor/advisor-reference-reliability-recommendations.md

@@ -84,7 +84,7 @@ A potential networking issue has been identified for your Container Apps Environ
 
 Learn more about [Managed Environment - CreateNewContainerAppsEnvironment (A potential networking issue has been identified with your Container Apps Environment that requires it to be re-created to avoid DNS issues)](https://aka.ms/createcontainerapp).
 
-## Cache for Redis
+## Cache
 
 ### Availability may be impacted from high memory fragmentation. Increase fragmentation memory reservation to avoid potential impact.
 
@@ -96,9 +96,28 @@ Learn more about [Redis Cache Server - RedisCacheMemoryFragmentation (Availabili
 
 ### Switch Secret version to ‘Latest’ for the Azure Front Door customer certificate
 
-We recommend configuring the Azure Front Door customer certificate secret to ‘Latest’ for the AFD to refer to the latest secret version in Azure Key Vault, so that the secret can be automatically rotated.
+We recommend configuring the Azure Front Door (AFD) customer certificate secret to ‘Latest’ for the AFD to refer to the latest secret version in Azure Key Vault, so that the secret can be automatically rotated.
 
 Learn more about [Front Door Profile - SwitchVersionBYOC (Switch Secret version to ‘Latest’ for the Azure Front Door customer certificate)](/azure/frontdoor/standard-premium/how-to-configure-https-custom-domain#certificate-renewal-and-changing-certificate-types).
+
+### Validate domain ownership by adding DNS TXT record to DNS provider.
+
+Validate domain ownership by adding DNS TXT record to DNS provider.
+
+Learn more about [Front Door Profile - ValidateDomainOwnership (Validate domain ownership by adding DNS TXT record to DNS provider.)](/azure/frontdoor/standard-premium/how-to-add-custom-domain#domain-validation-state).
+
+### Re-validate domain ownership for the Azure Front Door managed certificate renewal
+
+Azure Front Door cannot automatically renew the managed certificate because the domain is not CNAME mapped to AFD endpoint. Please re-validate domain ownership for the managed certificate to be automatically renewed.
+
+Learn more about [Front Door Profile - RevalidateDomainOwnership (Re-validate domain ownership for the Azure Front Door managed certificate renewal)](/azure/frontdoor/standard-premium/how-to-add-custom-domain#domain-validation-state).
+
+### Renew the expired Azure Front Door customer certificate to avoid service disruption.
+
+Some of the customer certificates for Azure Front Door Standard and Premium profiles expired. Please renew the certificate in time to avoid service disruption.
+
+Learn more about [Front Door Profile - RenewExpiredBYOC (Renew the expired Azure Front Door customer certificate to avoid service disruption.)](/azure/frontdoor/standard-premium/how-to-configure-https-custom-domain#use-your-own-certificate).
+
 ## Compute
 
 ### Migrate Virtual Machines to Availability Zones