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## Problem The pageserver generally trusts the storage controller/control plane to give it valid generations. However, sometimes it should be obvious that a generation is bad, and for defense in depth we should detect that on the pageserver. This PR is part 1 of 2: 1. in this PR we detect and warn on such situations, but do not block starting up the tenant. Once we have confidence that the check is not firing unexpectedly in the field 2. part 2 of 2 will introduce a condition that refuses to start a tenant in this situtation, and a test for that (maybe, if we can figure out how to spoof an ancient mtime) Related: #6951 ## Summary of changes - When loading an index older than 2 weeks, log an INFO message noting that we will check for other indices - When loading an index older than 2 weeks _and_ a newer-generation index exists, log a warning.