add serverless subscription tiers page

Author: mdbirnstiehl

solutions/observability/observability-serverless-subscription-tiers.md

@@ -0,0 +1,46 @@
+---
+navigation_title: Serverless subscription tiers
+applies_to:
+  serverless: ga
+products:
+  - id: observability
+---
+
+# {obs-serverless} subscription tiers
+
+{obs-serverless} projects are available in the following tiers:
+
+* **Observability Complete**: full-stack observability capabilities to monitor cloud-native and hybrid environments.
+* **Observability Logs Essentials**: everything you need to store and analyze logs at scale.
+
+For pricing information, refer to [Elastic Observability Serverless pricing](https://www.elastic.co/pricing/serverless-observability).
+
+Refer to the following table for an in-depth feature comparison.
+
+## Feature comparison
+
+| **Feature** | Observability Complete | Observability Logs Essentials |
+|---------|----------------------|-----------------------------------|
+| **Ad-hoc analytics** | ✅ | ✅ |
+| **[Out-of-the-box dashboards](/explore-analyze/dashboards.md)** | ✅ | ✅ |
+| **[Custom dashboards](/explore-analyze/dashboards/create-dashboard.md)** | ✅ | ✅ |
+| **[Alerting and notifications](/deploy-manage/monitor/monitoring-data/configure-stack-monitoring-alerts.md)** | ✅ | ✅ |
+| **[Integrations](https://www.elastic.co/integrations/data-integrations?solution=observability)** | ✅ | ✅ |
+| **[Machine learning](/explore-analyze/machine-learning.md)** | ✅ | ❌ |
+| **Rate and pattern analysis** | ✅ | ❌ |
+| **[Service level objectives (SLO)](/solutions/observability/incident-management/service-level-objectives-slos.md)** | ✅ | ❌ |
+| **Multi-signal investigations** | ✅ | ❌ |
+| **[APM](/solutions/observability/apm/index.md)** | ✅ | ❌ |
+| **[AI Assistant](/solutions/observability/observability-ai-assistant.md)** and Elastic Managed LLM | ✅ | ❌ |
+| **[Custom knowledge bases](/solutions/observability/observability-ai-assistant.md#obs-ai-kb-ui)** | ✅ | ❌ |
+| **[Synthetics testing and browser experience monitoring](/solutions/observability/synthetics/index.md)** | ✅ | ❌ |
+
+## Upgrade from Observability Logs Essentials to Observability Complete
+
+:::{warning}
+Upgrading from Observability Logs Essentials to Observability Complete is permanent and cannot be reversed.
+:::
+
+1. From the [{{ecloud}} Console](https://cloud.elastic.co), select **Manage** next to the Observability Logs Essentials serverless project you want to upgrade.
+1. Next to **Project features**, select **Edit**.
+1. Select **Observability Complete**.

solutions/toc.yml

@@ -91,6 +91,7 @@ toc:
       - file: search/ai-assistant.md
   - file: observability.md
     children:
+      - file: observability/observability-serverless-subscription-tiers.md
       - file: observability/get-started.md
         children:
           - file: observability/get-started/what-is-elastic-observability.md