Improve help text for key field while creating a variable
Release notes
Problem to solve
No validation message for the Key field while creating a new variable to indicate if the new variable can potentially override a predefined or inherited variable.
User experience goal
Users should know the criteria while defining a key so they don't have to correct them later.
Proposal
If the key does not meet the requirements, show the following message: A variable key can contain only letters, digits, and '_'
Add the following help text: "You can use CI/CD variables with the same name in different places, but the values can overwrite each other. What is the order of precedence for variables?"
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