Change Request: Guidelines for DNS Changes in Azure Core

[kyle-patterson]

Thank you for contributing to the design guidelines for Azure SDKs. We welcome all discussions and contributions. Since the design guidelines affect the client libraries for all Azure services, we thoroughly discuss and vet any design guideline changes before we incorporate them into the official guidance. This process can take some time, so your patience is appreciated.

** Before submitting, ensure you adjust the title of the issue appropriately **

The Basics

• Which design guideline is affected?
  https://azure.github.io/azure-sdk/general_azurecore.html

• Which target languages are affected?
  .NET, Java, JS/TS, Python

• Describe the change:
  Cosmos is requesting a means of detecting and adjusting for underlying DNS changes in Azure Core. The current request is to define what the current and expected behavior of Core should be in this situation.

For details, refer to

• Ensure DNS changes are detected by client azure-cosmos-dotnet-v3#3658

and a related fix in .NET:

• Default shared HttpClientTransport might not reflect DNS changes azure-sdk-for-net#19457

I'll defer to @kirankumarkolli and @jcocchi for further information

[kyle-patterson]

Scheduled for 4/10 2p-4p PDT