Automation check-in and rate limit changes on GitLab.com

What this post added

Introduced new rate limits on GitLab.com activity effective January 18, 2021: 500 requests/min for unauthenticated traffic per IP, 2,000 requests/min for authenticated API traffic per user, 1,000 requests/min for other authenticated HTTP traffic per user, and 2,000 requests/min for all traffic per IP when not otherwise covered. Documented these limits and advised users to handle 429 responses with the `Retry-After` header. The goal is to improve stability and availability.