Synthetic Bitbucket host request transcript
PR 1: HTTP 429, Retry-After: 600. PR 2: HTTP 200.

Base b3fdf2b10f
+0.000s GET /2.0/user
+2.421s GET /2.0/user
+2.448s GET /2.0/repositories/demo/web/pullrequests/1?fields=%2Bclosed_on
+2.449s GET /2.0/repositories/demo/web/pullrequests/1/diffstat?pagelen=50
+2.449s GET /2.0/repositories/demo/web/pullrequests/1/conflicts
+2.449s GET /2.0/repositories/demo/web/pullrequests/1/statuses?pagelen=50

Head 193ccfcede
+0.000s GET /2.0/user
+2.531s GET /2.0/user
+2.571s GET /2.0/repositories/demo/web/pullrequests/1?fields=%2Bclosed_on
+2.572s GET /2.0/repositories/demo/web/pullrequests/1/diffstat?pagelen=50
+2.572s GET /2.0/repositories/demo/web/pullrequests/1/conflicts
+2.572s GET /2.0/repositories/demo/web/pullrequests/1/statuses?pagelen=50
+2.612s GET /2.0/repositories/demo/web/pullrequests/1?fields=%2Bclosed_on
+2.613s GET /2.0/repositories/demo/web/pullrequests/1/comments?pagelen=50
+2.613s GET /2.0/repositories/demo/web/pullrequests/1/commits?pagelen=50
+5.950s GET /2.0/repositories/demo/web/pullrequests/2?fields=%2Bclosed_on
+5.951s GET /2.0/repositories/demo/web/pullrequests/2/diffstat?pagelen=50
+5.951s GET /2.0/repositories/demo/web/pullrequests/2/conflicts
+5.951s GET /2.0/repositories/demo/web/pullrequests/2/statuses?pagelen=50
+5.976s GET /2.0/user/workspaces/demo/permissions/repositories?q=repository.full_name%3D%22demo%2Fweb%22
+6.022s GET /2.0/repositories/demo/web/pullrequests/2?fields=%2Bclosed_on
+6.032s GET /2.0/repositories/demo/web/pullrequests/2/comments?pagelen=50
+6.033s GET /2.0/repositories/demo/web/pullrequests/2/commits?pagelen=50

Base: no outgoing PR 2 requests. Head: PR 2 detail, comments, and commits reached the stub seconds after PR 1 returned 429, before its 600-second pause expired.