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There are a number of IAM security roles related to monitoring. The big three are
viewer, editor, and admin.
To create the monitoring Workspace initially, a user will need the Monitoring Editor or
Admin role in the Workspace's host project.
The Monitoring Viewer can get read-only access to the Monitoring console and API.
The Monitoring Editor has read-write access to the Monitoring console and APIs and
can write monitoring data and configurations into the Workspace.
And the Monitoring Admin has full access to, and control over, all monitoring
resources.
Past these big three roles, monitoring roles exist to provide and limit access to alert
policies, dashboards, notification channels, service monitoring, and uptime checks.