feat: Add upgrading guide and navigation link to documentation

Docs/Content/installation/upgrading.md

@@ -0,0 +1,22 @@
+````markdown
+# Upgrading OneUptime
+
+This guide covers how to safely upgrade your self-hosted OneUptime installation.
+
+## General Guidance
+
+- Upgrade step-by-step across major versions (for example, 6 → 7 → 8). Do not skip major versions.
+- You can leapfrog minor/patch versions (for example, 8.1 → 8.4) as long as you follow the release notes.
+- Always take backups before upgrading, and validate you can restore them.
+
+## Upgrading from OneUptime 7 → 8
+
+If you're running on Kubernetes, there are important breaking changes:
+
+- We no longer use Bitnami charts for Postgres, Redis, and ClickHouse.
+- These changes are not backward compatible. You must follow the new structure in the Helm chart `values.yaml`.
+- Backup your data (Postgres, ClickHouse, and any persistent volumes) before upgrading.
+
+
+> Tip: Test the upgrade in a staging environment first. Confirm your workloads are healthy and data is intact before upgrading production.
+````

Docs/Utils/Nav.ts

@@ -33,6 +33,10 @@ const DocsNav: NavGroup[] = [
         title: "Docker Compose",
         url: "/docs/installation/docker-compose",
       },
+      {
+        title: "Upgrading",
+        url: "/docs/installation/upgrading",
+      },
       {
         title: "Kubernetes and Helm",
         url: "https://artifacthub.io/packages/helm/oneuptime/oneuptime",

README.md

@@ -71,6 +71,7 @@ If you need advanced features, such as API Access, Advanced Workflows, or Advanc
 - [Install on Kubernetes with Helm](https://artifacthub.io/packages/helm/oneuptime/oneuptime) (recommended for production)
 - [Install with Docker Compose](/Docs/Content/installation/docker-compose.md) (single-node install, not recommended for production)
 - [Install for Local Development](/Docs/Content/installation/local-development.md)
+- [Upgrade OneUptime](/Docs/Content/installation/upgrading.md)
 
 ## Philosophy