Draft fix for #10381

Author: alexanderlaw

test_runner/fixtures/pageserver/allowed_errors.py

@@ -95,6 +95,7 @@ def scan_pageserver_log_for_errors(
     # During teardown, we stop the storage controller before the pageservers, so pageservers
     # can experience connection errors doing background deletion queue work.
     ".*WARN deletion backend: calling control plane generation validation API failed.*error sending request.*",
+    ".*WARN init_tenant_mgr: calling control plane generation validation API failed.*error sending request.*",
     # Can happen when the test shuts down the storage controller while it is calling the utilization API
     ".*WARN.*path=/v1/utilization .*request was dropped before completing",
     # Can happen during shutdown