Tag limitations with public cloud providers

Products

• CloudHealth

Issue/Introduction

Tags are essentially pairs of user defined metadata made up of a name (key) and a value that are added to resources when they are created.

In AWS and Azure these are referred to as "Tags" whereas GCP refers to these as "Labels" apart from some network components where they are referenced as "Network Tags". 

Resolution

Tag limitations and restrictions

Platform	Max Tag Key Length	Max Tag Value Length	Allowed Chars	Case Sensitive	Max Tags per resource	Additional Notes
AWS	128	256	a-z, 0-9, + - =._:/@	Yes	50	Keys must be unique for each resource and have only one value
Azure	512	256	a-z, 0-9, _, -	No	50	Resources do not inherit tags hierarchically from respective resource group/subscriptions
GCP	63	63	a-z, 0-9, _, -	Yes	64	Keys must be unique for each resource and have only one value

AWS - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Using_Tags.html#tag-restrictions

Azure - https://learn.microsoft.com/en-us/azure/azure-resource-manager/management/tag-resources#limitations

GCP - https://cloud.google.com/compute/docs/labeling-resources#restrictions