[PR] [fix][broker] Inherit broker offload extra configs from empty policies [pulsar]

["coderzc (via GitHub)" <gi...@apache.org>]

coderzc opened a new pull request, #25781:
URL: https://github.com/apache/pulsar/pull/25781

   ### Motivation
   
   #25736 made broker-level `managedLedgerOffloadExtraConfig*` entries available to `OffloadPoliciesImpl.mergeConfiguration(...)`. However, `managedLedgerExtraConfigurations` defaults to an empty map, so a namespace or topic offload policy with no extra config still stops fallback to broker-level extra config.
   
   This can produce merged offload policies that inherit the broker driver/bucket/region but lose broker-level extra config such as a tiered-storage bucket prefix.
   
   ### Modifications
   
   - Merge `managedLedgerExtraConfigurations` as a map from broker -> namespace -> topic.
   - Treat null or empty higher-level extra config maps as unset so broker-level entries are inherited.
   - Preserve higher-level key overrides, including an explicit empty-string value to clear a broker-level key.
   - Add regression coverage for empty namespace-level extra config inheriting broker-level extra config.
   
   ### Verifying this change
   
   - `./gradlew :pulsar-common:test --tests org.apache.pulsar.common.policies.data.OffloadPoliciesTest`
   


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Re: [PR] [fix][broker] Use effective offload policies for extra configs [pulsar]

["coderzc (via GitHub)" <gi...@apache.org>]

coderzc merged PR #25781:
URL: https://github.com/apache/pulsar/pull/25781


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