### Release notes ### Problem to solve Before adding rotations to a schedule, a user needs to set up the blank calendar to work off of. Setting up a calendar includes naming, adding a description, and setting a timezone for it's display. These customizations are going to be specific to their team and function and will help them locate the schedule later for modifications. ### Intended users * [Devon (DevOps Engineer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#devon-devops-engineer) * [Allison (Application Ops)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#allison-application-ops) * [Priyanka (Platform Engineer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#priyanka-platform-engineer) ### User experience goal Allow people to add an on-call schedule. ### Proposal Creating a schedule should be limited to ONE schedule. Once a user has created a schedule, the add schedule button should be disabled. Introduce a modal whereby users can create a schedule for a particular timezone: | Modal | Time zone dropdown | Populated modal | | ------ | ------ | ------ | |  | |  | [Figma file](https://www.figma.com/file/gZF7Vvj1mmZGZFkV9wXTpY/Design-discovery-on-call-scheduling-gitlab-com-and-25995?node-id=362%3A0) Note: Have suggested basing the timezone dropdown on UTC time, as our internal teams base all of their on-call schedules on UTC. ### Further details This work supports the [Incident management](https://about.gitlab.com/direction/monitor/debugging_and_health/incident_management/) direction. ### Permissions and Security <!-- What permissions are required to perform the described actions? Are they consistent with the existing permissions as documented for users, groups, and projects as appropriate? Is the proposed behavior consistent between the UI, API, and other access methods (e.g. email replies)? 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See https://docs.gitlab.com/ee/user/permissions.html --> ### Availability & Testing <!-- This section needs to be retained and filled in during the workflow planning breakdown phase of this feature proposal, if not earlier. What risks does this change pose to our availability? How might it affect the quality of the product? What additional test coverage or changes to tests will be needed? Will it require cross-browser testing? Please list the test areas (unit, integration and end-to-end) that needs to be added or updated to ensure that this feature will work as intended. 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