[hotfix] docs(tracer): add v2.0 upgrade guide

charts/tracer/docs/UPGRADE-2.0.md

@@ -0,0 +1,118 @@
+# Helm Upgrade from v1.x to v2.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 `tracer` chart upgrade from `1.0.0` to `2.0.0-beta.6`. 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 | `1.0.0` | `2.0.0-beta.6` |
+| App version | `1.0.0` | `1.0.0` |
+
+## Configuration changes
+
+### Added values
+
+```yaml
+tracer.configmap.MULTI_TENANT_ALLOW_INSECURE_HTTP: "false"
+tracer.configmap.MULTI_TENANT_CACHE_TTL_SEC: "120"
+tracer.configmap.MULTI_TENANT_CIRCUIT_BREAKER_THRESHOLD: "5"
+tracer.configmap.MULTI_TENANT_CIRCUIT_BREAKER_TIMEOUT_SEC: "30"
+tracer.configmap.MULTI_TENANT_CONNECTIONS_CHECK_INTERVAL_SEC: "30"
+tracer.configmap.MULTI_TENANT_ENABLED: "false"
+tracer.configmap.MULTI_TENANT_IDLE_TIMEOUT_SEC: "300"
+tracer.configmap.MULTI_TENANT_MAX_TENANT_POOLS: "100"
+tracer.configmap.MULTI_TENANT_REDIS_HOST: ""
+tracer.configmap.MULTI_TENANT_REDIS_PORT: "6379"
+tracer.configmap.MULTI_TENANT_REDIS_TLS: "true"
+tracer.configmap.MULTI_TENANT_TIMEOUT: "30"
+tracer.configmap.MULTI_TENANT_URL: ""
+tracer.configmap.PLUGIN_AUTH_ADDRESS: "http://plugin-access-manager-auth.midaz-plugins.svc.cluster.local.:4000"
+tracer.secrets.API_KEY: ""
+```
+
+### Removed values
+
+```yaml
+tracer.configmap.CEL_CACHE_MAX_SIZE: "1000"
+tracer.configmap.CLEANUP_RETENTION_DAYS: "90"
+tracer.configmap.PLUGIN_AUTH_HOST: "http://plugin-access-manager-auth.midaz-plugins.svc.cluster.local.:4000"
+tracer.secrets.API_KEY_SECRET: ""
+```
+
+### Changed operational values
+
+```yaml
+# tracer.configmap.SERVER_ADDRESS
+#   previous: ":8080"
+#   current:  ":4020"
+# tracer.configmap.SERVER_PORT
+#   previous: "8080"
+#   current:  "4020"
+# tracer.configmap.SWAGGER_HOST
+#   previous: ":8080"
+#   current:  ":4020"
+# tracer.service.port
+#   previous: 8080
+#   current:  4020
+```
+
+## Breaking changes to review
+
+The following values were removed and should be deleted from custom values files before the upgrade:
+
+```yaml
+tracer.configmap.CEL_CACHE_MAX_SIZE: "1000"
+tracer.configmap.CLEANUP_RETENTION_DAYS: "90"
+tracer.configmap.PLUGIN_AUTH_HOST: "http://plugin-access-manager-auth.midaz-plugins.svc.cluster.local.:4000"
+tracer.secrets.API_KEY_SECRET: ""
+```
+
+## Template changes
+
+### Added files
+
+- No chart files added.
+
+### Removed files
+
+- No chart files removed.
+
+### Modified files
+
+- `charts/tracer/Chart.yaml`
+- `charts/tracer/README.md`
+- `charts/tracer/templates/configmap.yaml`
+- `charts/tracer/templates/deployment.yaml`
+- `charts/tracer/templates/secrets.yaml`
+- `charts/tracer/values-template.yaml`
+- `charts/tracer/values.yaml`
+
+## Migration steps
+
+1. Read this guide and compare your custom values against `charts/tracer/values.yaml`.
+2. Remove values that no longer exist in the chart before running the upgrade.
+3. Add any required new values for your environment, especially secrets, configmaps, probes, ingress, and service settings.
+4. Render the chart locally with your production values and review the manifest diff.
+5. Apply the upgrade in a controlled environment before production.
+
+## Preview changes before upgrading
+
+```bash
+helm diff upgrade tracer ./charts/tracer \
+  --namespace <namespace> \
+  --values <your-values.yaml>
+```
+
+## Command to upgrade
+
+```bash
+helm upgrade tracer ./charts/tracer \
+  --namespace <namespace> \
+  --values <your-values.yaml>
+```