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v26.40.1 release notes #38675

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10 changes: 10 additions & 0 deletions doc/user/content/releases/_index.md
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Expand Up @@ -19,6 +19,16 @@ Starting with the v26.1.0 release, Materialize releases on a weekly schedule for
both Cloud and Self-Managed. See [Release schedule](/releases/schedule) for details.
{{</ note >}}

## v26.40.1
*Released to Materialize Cloud: 2026-09-05* <br>
*Released to Materialize Self-Managed: 2026-09-06* <br>

### Improvements {#v26.40.1-improvements}
- **Smaller Prometheus scrape payloads**: `environmentd` no longer exports the unused `mz_timestamp_difference_for_strict_serializable_ms` metric, which accounted for roughly 7% of one large environment's `/metrics` response, and `mz_time_to_first_row_seconds` drops two sub-millisecond buckets that held 12 observations out of 16.1 million in that same environment.

### Bug Fixes {#v26.40.1-bug-fixes}
- Fixed per-cluster `mz_time_to_first_row_seconds` series accumulating indefinitely for clusters that had already been dropped, which inflated `/metrics` responses in environments with high cluster churn; these series are now reclaimed when the cluster is dropped.

## v26.40.0
*Released to Materialize Cloud: 2026-09-02* <br>
*Released to Materialize Self-Managed: 2026-09-03* <br>
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5 changes: 5 additions & 0 deletions doc/user/data/self_managed/self_managed_operator_compatibility.yml
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Expand Up @@ -5,6 +5,11 @@ columns:
- column: Release date
- column: Notes
rows:
- Materialize Operator: v26.40.1
orchestratord version: v26.40.1
environmentd version: v26.40.1
Release date: "2026-09-06"
Notes: "See [v26.40.1 release notes](/releases/#v26401)"
- Materialize Operator: v26.40
orchestratord version: v26.40
environmentd version: v26.40
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