Bug Fixes

• Fixes a bug in Redpanda Iceberg manifest deserialization that would cause Redpanda to fail to commit new Iceberg files following an external operation that wrote manifests with the lower_bounds field. by @andrwng in #27519
• Fixes a bug where concurrent log level setting requests could lead to a situation where the logger ended up expiring to the incorrect log level. by @pgellert in #27567
• Prevent oversized allocations when the kafka logger is at trace level by @rockwotj in #27816
• Redpanda will now properly clean up discarded on-disk files on certain error cases in the Iceberg topics write path. by @andrwng in #27766

Improvements

• Allows waiting for collection to complete when running a remote-bundle by @JFlath in #27399
• Pandaproxy: Allow more parallel requests per user when HTTP basic authentication is enabled by @pgellert in #27820
• Prevents an oversized allocation in raft heartbeats. by @WillemKauf in #27777
• Prevents an oversized allocation in the partition balancing subsystem. by @WillemKauf in #27761
• Redpanda will now log less frequently to warn about using the default Iceberg partition spec with ÅWS Glue. by @andrwng in #27744
• Redpanda will now log trace-level messages about failed requests to the Iceberg REST catalog. by @andrwng in #27744

Full Changelog: v25.1.11...v25.1.12