Add Data Catalog page to Data Observability section (DataDog#35472)

* Add Data Catalog page to Data Observability section

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Apply suggestions from code review

Co-authored-by: Olivia Shoup <116908616+OliviaShoup@users.noreply.github.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Olivia Shoup <116908616+OliviaShoup@users.noreply.github.com>

Author: 3 people

config/_default/menus/main.en.yaml

@@ -4969,6 +4969,12 @@ menu:
       identifier: data_observability
       parent: data_observability_heading
       weight: 60000
+    - name: Data Catalog
+      url: data_observability/data_catalog
+      pre: data-observability-wui
+      identifier: data_catalog
+      parent: data_observability_heading
+      weight: 65000
     - name: Quality Monitoring
       url: data_observability/quality_monitoring/
       pre: data-observability-wui

content/en/data_observability/_index.md

@@ -2,6 +2,9 @@
 title: Data Observability Overview
 description: "Monitor data quality, performance, and cost with Data Observability to detect anomalies, analyze data lineage, and prevent issues affecting downstream systems."
 further_reading:
+ - link: '/data_observability/data_catalog/'
+   tag: 'Documentation'
+   text: 'Data Catalog'
  - link: '/data_observability/quality_monitoring/'
    tag: 'Documentation'
    text: 'Quality Monitoring'
@@ -28,6 +31,7 @@ Data Observability (DO) helps data teams improve the reliability of data for ana
 ## Get started
 
 {{< whatsnext desc="Data Observability consists of the following:" >}}
+   {{< nextlink href="/data_observability/data_catalog/" >}}Data Catalog: Browse and search a centralized inventory of your data assets across connected integrations.{{< /nextlink >}}
    {{< nextlink href="/data_observability/quality_monitoring/" >}}Quality Monitoring: Identify data issues before downstream BI and AI applications are impacted.{{< /nextlink >}}
    {{< nextlink href="/data_observability/jobs_monitoring/" >}}Jobs Monitoring: Observe, troubleshoot, and optimize jobs across your data pipelines.{{< /nextlink >}}
 {{< /whatsnext >}}

content/en/data_observability/data_catalog.md

@@ -0,0 +1,47 @@
+---
+title: Data Catalog
+description: "Browse and search a centralized inventory of data assets, automatically populated from connected integrations."
+further_reading:
+  - link: '/data_observability/'
+    tag: 'Documentation'
+    text: 'Data Observability Overview'
+  - link: '/data_observability/quality_monitoring/'
+    tag: 'Documentation'
+    text: 'Quality Monitoring'
+  - link: '/data_observability/jobs_monitoring/'
+    tag: 'Documentation'
+    text: 'Jobs Monitoring'
+---
+
+The Data Catalog is a searchable, centralized inventory of data assets (tables, schemas, databases, and pipeline jobs) automatically populated from your connected integrations.
+The catalog stays in sync with [supported data sources](/data_observability/quality_monitoring/#supported-data-sources) so your team always has an up-to-date view of what exists, who owns it, and how healthy it is.
+
+## Browsing the catalog
+
+When you open the catalog at [/data-obs/catalog](https://app.datadoghq.com/data-obs/catalog), you see a list of all assets across your connected integrations. Each asset card displays:
+
+- **Asset type**: table, schema, dashboard, job, etc.
+- **Name** and path (e.g., `account > database > schema`)
+- **Integration and account**: the source system and account it was synced from
+- **Description**: pulled from the source system if available
+- **Links to the source system**: direct references back to the origin platform so you can navigate from the catalog to the source in one click
+- **Tags**: `key:value` metadata pairs pulled from the source system if available
+- **Monitor Status**: displays the state of any active [Data Quality Monitors](/data_observability/quality_monitoring/) on the asset
+- **Lineage**: upstream and downstream dependencies, where supported by the integration
+
+Use the left sidebar to filter assets by type: **All assets**, **Databases**, **Schemas**, or **Tables**. Connected integrations (such as Snowflake, dbt, and BigQuery) are also listed individually in the sidebar.
+
+## Search & filtering
+
+The search bar at the top of the catalog supports both free-text and field-scoped queries.
+
+**Full-text search** matches across all asset fields. Typing a term and selecting "Search all fields for..." returns any asset containing that value, anywhere in its metadata. Only the Catalog supports full-text search. Other Data Observability views like Monitors and Lineage do not.
+
+**Tag search** lets you target a specific attribute using `key:value` syntax. The available fields depend on which integrations you have connected. As you type, the search dropdown suggests the fields available in your environment. Any tag key on your assets can also be used as a search field. For example, `data_owner:TS-OPS-ANALYTICS` filters to assets tagged with that owner.
+
+Wildcards and unions are also supported:
+- **Wildcard**: `name:dim_zendesk*` matches any asset whose name starts with `dim_zendesk`
+- **Union**: `data_owner:(team-a OR team-b)` matches assets owned by either team
+- **Intersection**: `dim_zendesk AND data_owner:TS-OPS-ANALYTICS`
+
+Recent searches are saved and surfaced in the dropdown for quick reuse.