docs(lerian-notification): add v1.0 upgrade guide

charts/lerian-notification/docs/UPGRADE-1.0.md

@@ -0,0 +1,88 @@
+# Helm Upgrade from v0.x to v1.x
+## Topics
+- **[Overview](#overview)**- **[Version changes](#version-changes)**- **[Configuration changes](#configuration-changes)**- **[Breaking changes to review](#breaking-changes-to-review)**- **[Template changes](#template-changes)**- **[Migration steps](#migration-steps)**- **[Preview changes before upgrading](#preview-changes-before-upgrading)**- **[Command to upgrade](#command-to-upgrade)**
+
+## Overview
+This guide covers the `lerian-notification` chart upgrade from `0.1.0` to `1.0.0-beta.3`. It was generated retroactively from the chart history and focuses on major version changes; patch-only releases are intentionally ignored.
+
+Because this is a major upgrade, review all removed values, renamed templates, and changed defaults before applying it to production.
+
+## Version changes
+
+| Field | Previous | Current |
+|-------|----------|---------|
+| Chart version | `0.1.0` | `1.0.0-beta.3` |
+| App version | `0.1.0` | `0.1.0` |
+
+## Configuration changes
+
+### Added values
+
+```yaml
+api.securityContext.allowPrivilegeEscalation: false
+api.securityContext.seccompProfile.type: "RuntimeDefault"
+migrations.securityContext.allowPrivilegeEscalation: false
+migrations.securityContext.seccompProfile.type: "RuntimeDefault"
+secrets.DATABASE_URL: ""
+workerEmail.securityContext.allowPrivilegeEscalation: false
+workerEmail.securityContext.seccompProfile.type: "RuntimeDefault"
+workerSms.securityContext.allowPrivilegeEscalation: false
+workerSms.securityContext.seccompProfile.type: "RuntimeDefault"
+workerWebhook.securityContext.allowPrivilegeEscalation: false
+workerWebhook.securityContext.seccompProfile.type: "RuntimeDefault"
+```
+
+### Removed values
+
+_No direct values.yaml key changes detected._
+
+### Changed operational values
+
+_No image, env, secret, probe, ingress, service, port, or enablement changes detected in values.yaml._
+
+## Breaking changes to review
+
+No removed values were detected in `values.yaml`, but this is still a major chart version. Review the template changes below before rollout.
+
+## Template changes
+
+### Added files
+
+- No chart files added.
+
+### Removed files
+
+- No chart files removed.
+
+### Modified files
+
+- `charts/lerian-notification/Chart.yaml`
+- `charts/lerian-notification/templates/api/hpa.yaml`
+- `charts/lerian-notification/templates/api/pdb.yaml`
+- `charts/lerian-notification/templates/configmap.yaml`
+- `charts/lerian-notification/templates/migrations-job.yaml`
+- `charts/lerian-notification/templates/secret.yaml`
+- `charts/lerian-notification/values.yaml`
+
+## Migration steps
+
+1. Read this guide and compare your custom values against `charts/lerian-notification/values.yaml`.
+2. Add any required new values for your environment, especially secrets, configmaps, probes, ingress, and service settings.
+3. Render the chart locally with your production values and review the manifest diff.
+4. Apply the upgrade in a controlled environment before production.
+
+## Preview changes before upgrading
+
+```bash
+helm diff upgrade lerian-notification ./charts/lerian-notification \
+  --namespace <namespace> \
+  --values <your-values.yaml>
+```
+
+## Command to upgrade
+
+```bash
+helm upgrade lerian-notification ./charts/lerian-notification \
+  --namespace <namespace> \
+  --values <your-values.yaml>
+```