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[fix][client] Fix unAckedMessageTracker cleanup on multi-topics batch ack

release/4.0.12

release/4.2.3

Status: Open (in progress).

apache/pulsarnumber 26001

#26001 In apache/pulsar;

· Dream95 opened on Jun 11, 2026

[Fn][Observability] Status of OpenTelemetry metrics support (PIP-264/PIP-320)

triage/lhotari/importantlhotari's triaging label for important issues or PRslhotari's triaging label for important issues or PRs

type/enhancementThe enhancements for the existing features or docs. e.g. reduce memory usage of the delayed messagesThe enhancements for the existing features or docs. e.g. reduce memory usage of the delayed messages

Status: Open.

#25885 In apache/pulsar;

· Dream95 opened on May 28, 2026

[fix][client] Fix incorrect topic in OTel spans for partitioned producers

Status: Open (in progress).

apache/pulsarnumber 25896

#25896 In apache/pulsar;

· void-ptr974 opened on May 30, 2026

[Enhancement] Optimize code that uses cursor.getNumberOfEntriesInBacklog(true) > 0

type/enhancementThe enhancements for the existing features or docs. e.g. reduce memory usage of the delayed messagesThe enhancements for the existing features or docs. e.g. reduce memory usage of the delayed messages

Status: Open.

#26036 In apache/pulsar;

· lhotari opened on Jun 16, 2026

[fix][broker] Fix geo-replication stuck after a failed publish to the remote cluster

release/4.0.12

release/4.2.3

triage/lhotari/importantlhotari's triaging label for important issues or PRslhotari's triaging label for important issues or PRs

Status: Open (in progress).

apache/pulsarnumber 26002

#26002 In apache/pulsar;

· void-ptr974 opened on Jun 11, 2026

[fix][client] Fix UnAckedMessageRedeliveryTracker to skip cancelled timeouts

release/4.0.12

release/4.2.3

Status: Open (in progress).

apache/pulsarnumber 26043

#26043 In apache/pulsar;

· Dream95 opened on Jun 17, 2026

[improve][build] Switch default JDK to 25 for 5.0.0-M2

Status: Open (in progress).

apache/pulsarnumber 26070

#26070 In apache/pulsar;

· lhotari opened on Jun 20, 2026