Soft warning
From 90% of a counted limit, Billing and the app show that you are close. Nothing is deleted.
Hard block
If users, clients, or assets exceed the plan, new creates (including invites and CSV imports that would add rows) are rejected. You can still open existing clients and assets, export CSV, and change billing. Reduce counts or upgrade to write again.
SSL-check and reminder-email meters are period usage. Hitting those caps stops extra checks or reminder emails for the rest of the period; it does not hide records.