Add changelog for Workers KV updated storage providers (#24607)

* thomasgauvin: add changelog for workers kv new hybrid providers

* nit

* Update src/content/changelog/kv/2025-08-22-kv-performance-improvements.mdx

Co-authored-by: Matt Silverlock <[email protected]>

* Update src/content/changelog/kv/2025-08-22-kv-performance-improvements.mdx

Co-authored-by: Matt Silverlock <[email protected]>

* Update src/content/changelog/kv/2025-08-22-kv-performance-improvements.mdx

Co-authored-by: Matt Silverlock <[email protected]>

* Update src/content/changelog/kv/2025-08-22-kv-performance-improvements.mdx

Co-authored-by: Matt Silverlock <[email protected]>

* Update src/content/changelog/kv/2025-08-22-kv-performance-improvements.mdx

* Update src/content/changelog/kv/2025-08-22-kv-performance-improvements.mdx

---------

Co-authored-by: Matt Silverlock <[email protected]>

Author: thomasgauvin

src/assets/images/kv/changelog/kv-hybrid-providers-performance-improvements.png

@@ -0,0 +1,20 @@
+---
+title: Workers KV completes hybrid storage provider rollout for improved performance, fault-tolerance
+description: Workers KV adds new storage providers on Cloudflare's infrastructure, delivering significant latency improvements with p95 latency reduced by 67% and p99 by 29%.
+products:
+  - kv
+date: 2025-08-22 12:00:00 UTC
+---
+
+Workers KV has completed rolling out performance improvements across all KV namespaces, providing a significant latency reduction on read operations for all KV users. This is due to architectural changes to KV's underlying storage infrastructure, which introduces a new metadata later and substantially improves redundancy.
+
+![Workers KV latency improvements showing P95 and P99 performance gains in Europe, Asia, Africa and Middle East regions as measured within KV's internal storage gateway worker.](~/assets/images/kv/changelog/kv-hybrid-providers-performance-improvements.png)
+
+## Performance improvements
+
+The new hybrid architecture delivers substantial latency reductions throughout Europe, Asia, Middle East, Africa regions. Over the past 2 weeks, we have observed the following:
+
+- **p95 latency**: Reduced from ~150ms to ~50ms (67% decrease)
+- **p99 latency**: Reduced from ~350ms to ~250ms (29% decrease)
+
+