docs: [Self-Hosted Changelog Bot] Changelog updates for new version(s) (#4197)

Automated changelog update created by the LangGraph Server Changelog
Bot.

Feel free to merge anytime.

Author: lnhsingh

src/langsmith/self-hosted-changelog.mdx

@@ -11,6 +11,15 @@ rss: true
 
 [Self-hosted LangSmith](/langsmith/self-hosted) is an add-on to the Enterprise plan designed for our largest, most security-conscious customers. For more details, refer to [Pricing](https://www.langchain.com/pricing). [Contact our sales team](https://www.langchain.com/contact-sales) if you want to get a license key to trial LangSmith in your environment.
 
+<Update label="2026-05-29" tags={["self-hosted"]} rss={{ title: "2026-05-29 - self-hosted" }}>
+## langsmith-0.15.1
+
+- Fixed a bug where the blob storage banner incorrectly flashed on page load.
+- Fixed an issue in self-hosted OIDC (v15) where the SSO Groups Sync silently no-op'ed during login.
+
+**Download the Helm chart:** [`langsmith-0.15.1.tgz`](https://github.com/langchain-ai/helm/releases/download/langsmith-0.15.1/langsmith-0.15.1.tgz)
+</Update>
+
 <Update label="2026-05-26" tags={["self-hosted"]}>
 ## langsmith-0.15.0