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Object storage: warn that default thanos client may have invalidated config #23729

Description

@bboreham

Is your feature request related to a problem? Please describe.

I got an error from logcli:

2026/08/03 13:47:29 Query failed: create bucket: no s3 endpoint in config file
error creating object client

which it took me a long time to solve. It turned out to be triggered by the change to Use Thanos storage clients by default.

Describe the solution you'd like
Include as part of the error some text like "now that use_thanos_objstore is on by default you may need to update your config file".

Describe alternatives you've considered
Could advise people to set use_thanos_objstore: false, but the non-thanos code is expected to be removed some day.

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