Add deprecation notice for metric[].name syntax (#8070)
Add deprecation notice for metric[].name syntax (#8070)

* Add deprecation notice

* Improve wording
DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core