I've found some docs with resources limitation in Azure DevOps:
- https://docs.microsoft.com/en-us/azure/devops/user-guide/service-limits?view=azure-devops
- https://docs.microsoft.com/en-us/azure/devops/organizations/settings/work/object-limits?view=azure-devops
But I cannot find any info about limitation of variables number in builds and releases. Can anyone share this info?