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When sanitizing the bridge pool assignments for #2372 (moved), I noticed that the BridgeDB logs mention some bridge fingerprints more than once with changing IP addresses. Here is an example:

Sep 29 08:07:15 [DEBUG] Leaving bridge --.--.--.138:443 -----------------------------------bc654 unallocated
Sep 29 08:07:16 [DEBUG] Leaving bridge --.--.--.138:443 -----------------------------------bc654 unallocated
Sep 29 08:07:16 [DEBUG] Leaving bridge --.--.--.138:443 -----------------------------------bc654 unallocated
Sep 29 08:07:17 [DEBUG] Leaving bridge --.--.---.34:443 -----------------------------------bc654 unallocated
Sep 29 08:07:17 [DEBUG] Leaving bridge --.--.---.34:443 -----------------------------------bc654 unallocated
Sep 29 08:07:17 [DEBUG] Leaving bridge --.--.---.34:443 -----------------------------------bc654 unallocated
Sep 29 08:07:18 [DEBUG] Leaving bridge ---.--.---.219:443 -----------------------------------bc654 unallocated

Sep 29 08:07:12 [DEBUG] Adding bridge ---.---.--.3:443 -----------------------------------d80ca to email ring
Sep 29 08:07:16 [DEBUG] Adding bridge --.---.--.31:443 -----------------------------------d80ca to email ring
Sep 29 08:07:16 [DEBUG] Adding bridge --.---.--.31:443 -----------------------------------d80ca to email ring
Sep 29 08:07:17 [DEBUG] Adding bridge ---.---.--.238:443 -----------------------------------d80ca to email ring
Sep 29 08:07:17 [DEBUG] Adding bridge ---.---.--.238:443 -----------------------------------d80ca to email ring
Sep 29 08:07:17 [DEBUG] Adding bridge ---.---.--.253:443 -----------------------------------d80ca to email ring
Sep 29 08:07:17 [DEBUG] Adding bridge ---.---.--.253:443 -----------------------------------d80ca to email ring
Sep 29 08:07:17 [DEBUG] Adding bridge ---.---.--.54:443 -----------------------------------d80ca to email ring
Sep 29 08:07:17 [DEBUG] Adding bridge --.---.--.17:443 -----------------------------------d80ca to email ring
Sep 29 08:07:17 [DEBUG] Adding bridge ---.---.--.167:443 -----------------------------------d80ca to email ring
Sep 29 08:07:17 [DEBUG] Adding bridge ---.---.--.148:443 -----------------------------------d80ca to email ring
Sep 29 08:07:17 [DEBUG] Adding bridge ---.---.--.37:443 -----------------------------------d80ca to email ring
Sep 29 08:07:18 [DEBUG] Adding bridge ---.---.--.37:443 -----------------------------------d80ca to email ring
Sep 29 08:07:18 [DEBUG] Adding bridge --.---.--.117:443 -----------------------------------d80ca to email ring
Sep 29 08:07:18 [DEBUG] Adding bridge ---.---.--.26:443 -----------------------------------d80ca to email ring
Sep 29 08:07:18 [DEBUG] Adding bridge --.---.--.91:443 -----------------------------------d80ca to email ring
Sep 29 08:07:18 [DEBUG] Adding bridge ---.---.--.225:443 -----------------------------------d80ca to email ring
Sep 29 08:07:18 [DEBUG] Adding bridge ---.---.--.3:443 -----------------------------------d80ca to email ring
Sep 29 08:07:19 [DEBUG] Adding bridge ---.---.--.235:443 -----------------------------------d80ca to email ring

I didn't find a case when a bridge was added to different rings, but I didn't look closely. I wonder if this affects giving out bridges in some way, either by giving out a bridge's old IP address or by giving out a bridge more often than others.