> For the complete documentation index, see [llms.txt](https://docs.orangebit.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.orangebit.com/changelog/v1.6.md).

# v1.6

#### Prod

* [x] **v1.6.2 — Oct 20th**

  🔍 Observability

  * Added trace\_id propagation across REST and WS streams for multi-hop debugging.
  * Exported Prometheus metrics for orderflow, matching\_latency\_ms, and ws\_msg\_rate.

***

* [x] **v1.6.1 — Oct 10th**

  ⚙️ API Updates

  * Introduced If-Match: \<etag> support for safe order edits and idempotency.
  * Added client\_order\_tag to allow user-defined grouping of orders.

***

* [x] **v1.6.0 — Oct 6th**

  🧩 Resilience

  * Implemented hotspot partitioning to route heavy-symbol traffic to dedicated match nodes.
  * Connection pool improvements reduced API 5xx spikes by 40%.