Fixed broken links. (dotnet#22624)

Author: Sumit Ghosh

docs/architecture/cloud-native/application-resiliency-patterns.md

@@ -9,7 +9,7 @@ ms.date: 01/19/2021
 
 The first line of defense is application resiliency.
 
-While you could invest considerable time writing your own resiliency framework, such products already exist. [Polly](http://www.thepollyproject.org/) is a comprehensive .NET resilience and transient-fault-handling library that allows developers to express resiliency policies in a fluent and thread-safe manner. Polly targets applications built with either the .NET Framework or .NET 5. The following table describes the resiliency features, called `policies`, available in the Polly Library. They can be applied individually or grouped together.
+While you could invest considerable time writing your own resiliency framework, such products already exist. [Polly](https://dotnetfoundation.org/projects/polly) is a comprehensive .NET resilience and transient-fault-handling library that allows developers to express resiliency policies in a fluent and thread-safe manner. Polly targets applications built with either the .NET Framework or .NET 5. The following table describes the resiliency features, called `policies`, available in the Polly Library. They can be applied individually or grouped together.
 
 | Policy | Experience |
 | :-------- | :-------- |

docs/architecture/cloud-native/logging-with-elastic-stack.md

@@ -12,7 +12,7 @@ Collectively these tools are known as the Elastic Stack or ELK stack.
 
 ## Elastic Stack
 
-The Elastic Stack is a powerful option for gathering information from a Kubernetes cluster. Kubernetes supports sending logs to an Elasticsearch endpoint, and for the [most part](https://kubernetes.io/docs/tasks/debug-application-cluster/logging-elasticsearch-kibana/), all you need to get started is to set the environment variables as shown in Figure 7-5:
+The Elastic Stack is a powerful option for gathering information from a Kubernetes cluster. Kubernetes supports sending logs to an Elasticsearch endpoint, and for the [most part](https://v1-19.docs.kubernetes.io/docs/tasks/debug-application-cluster/logging-elasticsearch-kibana/), all you need to get started is to set the environment variables as shown in Figure 7-5:
 
 ```kubernetes
 KUBE_LOGGING_DESTINATION=elasticsearch

docs/architecture/cloud-native/resilient-communications.md

@@ -74,7 +74,7 @@ The Azure cloud embraces Istio and provides direct support for it within Azure K
 
 ### References
 
-- [Polly](http://www.thepollyproject.org/)
+- [Polly](https://dotnetfoundation.org/projects/polly)
 
 - [Retry pattern](/azure/architecture/patterns/retry)