Merge pull request docker#11578 from binman-docker/master

Add other limit info and more 3rd parties

Author: usha-mandya

docker-hub/download-rate-limit.md

@@ -59,9 +59,26 @@ If you are running Kubernetes, follow the instructions in [Pull an Image from a
 
 If you are using any third-party platforms, follow your provider’s instructions on using registry authentication.
 
+- [Artifactory](https://www.jfrog.com/confluence/display/JFROG/Advanced+Settings#AdvancedSettings-RemoteCredentials){: target="_blank" rel="noopener" class="_"}
+- [AWS CodeBuild](https://aws.amazon.com/blogs/devops/how-to-use-docker-images-from-a-private-registry-in-aws-codebuild-for-your-build-environment/){: target="_blank" rel="noopener" class="_"}
+- [AWS ECS/Fargate](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/private-auth.html){: target="_blank" rel="noopener" class="_"}
+- [Azure Pipelines](https://docs.microsoft.com/en-us/azure/devops/pipelines/library/service-endpoints?view=azure-devops&tabs=yaml#sep-docreg){: target="_blank" rel="noopener" class="_"}
 - [CircleCI](https://circleci.com/docs/2.0/private-images/){: target="_blank" rel="noopener" class="_"}
-- [Drone.io](https://docs.drone.io/pipeline/docker/syntax/images/#pulling-private-images){: target="_blank" rel="noopener" class="_"}
 - [Codefresh](https://codefresh.io/docs/docs/docker-registries/external-docker-registries/docker-hub/){: target="_blank" rel="noopener" class="_"}
+- [Drone.io](https://docs.drone.io/pipeline/docker/syntax/images/#pulling-private-images){: target="_blank" rel="noopener" class="_"}
 - [LayerCI](https://layerci.com/docs/advanced-workflows#logging-in-to-docker){: target="_blank" rel="noopener" class="_"}
-- [AWS ECS/Fargate](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/private-auth.html){: target="_blank" rel="noopener" class="_"}
-- [AWS CodeBuild](https://aws.amazon.com/blogs/devops/how-to-use-docker-images-from-a-private-registry-in-aws-codebuild-for-your-build-environment/){: target="_blank" rel="noopener" class="_"}
+
+## Other limits
+
+Docker Hub also has an overall rate limit to protect the application 
+and infrastructure. This limit applies to all requests to Hub 
+properties including web pages, APIs, image pulls, etc. The limit is 
+applied per-IP, and while the limit changes over time depending on load
+and other factors, it is in the order of thousands of requests per 
+minute. The overall rate limit applies to all users equally
+regardless of account level.
+
+You can differentiate between these limits by looking at the error 
+code. The "overall limit" will return a simple `429 Too Many Requests` 
+response. The image download limit returns a longer error message that 
+includes a link to this page.