• Problem: During the parse → render round trip, query renderers dropped or altered parsed constructs, and two-argument LOCATE(...) could throw a NullPointerException.
• Change: Corrected visitor logic for TREAT(...), two-argument LOCATE(...), collection-member subqueries, and the HQL column(...) cast target across JpqlQueryRenderer, EqlQueryRenderer, and HqlQueryRenderer. These fixes required no ANTLR grammar changes.
• Verification: Added round-trip regression coverage for all four defects. #4273 was integrated, polished by the maintainer, and backported.

• Problem: JPQL / EQL rejected valid collection-membership expressions using single-character string literals or map KEY(...) / VALUE(...) operands. HQL rejected Hibernate's LIKE REGEXP and ILIKE REGEXP forms.
• Change: Added CHARACTER support to the relevant JPQL / EQL literal rules, allowed map field identification variables as collection-membership operands, and added the HQL REGEXP modifier after LIKE / ILIKE.
• Verification: Checked collection-membership forms against Jakarta Persistence semantics, Hibernate ORM, and EclipseLink. Added shared renderer TCK coverage, HQL single-character parity tests, and HQL round-trip cases for LIKE REGEXP, NOT LIKE REGEXP, and ILIKE REGEXP. Upstreamed through #4282, #4292, #4289, and #4295.

Additional upstreamed work includes @IdClass / @ManyToOne repository regression coverage (#4271), renderer cleanup (#4274), and documentation corrections (#4262, #4270).

• Problem: Provider differences in streaming deltas could fragment a logical tool call or discard reasoning state required for a valid tool-result replay.
• Change: Merged OpenAI-compatible tool-call deltas by index, including omitted or empty IDs and parallel calls; preserved reasoning_content / reasoning during chunk merging and message aggregation; and replayed Bedrock signed or redacted reasoning and Anthropic thinking or redacted-thinking blocks before their corresponding tool-use blocks.
• Verification: Added coverage for split and parallel calls, streamed reasoning aggregation, next-turn replay, and signed or redacted reasoning. The work spans OpenAI-compatible providers including DeepSeek and OpenRouter, Amazon Bedrock Converse, and Anthropic: #6373, #6381, #6414, and #6551.

• Problem: Recursive advisors reported only the final model call's token usage, omitting earlier tool-calling rounds or validation retries.
• Change: Introduced reusable usage accumulation for ToolCallingAdvisor call and stream paths, returnDirect responses, and StructuredOutputValidationAdvisor retry loops.
• Verification: Covered usage arithmetic, cache metrics, streaming subscriptions, tool-call recursion, direct returns, and exhausted validation retries. Merged upstream in #6424.

• Problem: Parameter schemas were nested under properties.<param>, while generated $refs still targeted root-level $defs, leaving recursive references unresolved.
• Change: Hoisted $defs to the wrapper root, reused structurally equal definitions, renamed simple-name collisions, and rewrote peer references in both JsonSchemaGenerator and McpJsonSchemaGenerator.
• Verification: Added regression coverage for transitive recursion, equal definitions, and name collisions with reference rewrites. Refined with the maintainer and integrated upstream through #6035.

• Problem: Cache binders could register meters that silently reported zero when statistics collection was disabled, making missing measurements difficult to distinguish from actual zero activity.
• Change: JCache checks CompleteConfiguration#isStatisticsEnabled(). New Hazelcast constructor and monitor overloads accept Config and resolve map settings through the public Config#findMapConfig(name) API. Both warn and skip statistics-dependent meters when statistics are disabled. Existing Hazelcast overloads retain their behavior; JCache assumes statistics are enabled if the provider cannot expose the configuration. The enabled state is captured at binder construction, so enabling statistics later requires creating and binding a new instance.
• Verification: Added regression tests for warnings and omitted meters, plus coverage that existing Hazelcast overloads still register meters without Config. The Hazelcast change also includes OSGi package-import support. Both changes merged upstream: #7562, #7568.

Additional upstreamed documentation covers runtime statistics changes in JCache (#7837), shutdown responsibilities for closeable meter binders (#7549), and Prometheus LongTaskTimer output (#7546).