Docs: add Observability MCP server page

Renée Hendricksenrequested to merge
o11y-mcp-server-docs into master

What does this MR do?

Adds customer-facing documentation for the GitLab Observability Model Context Protocol (MCP) server, so users can connect an AI assistant or MCP client and query their observability data with natural language.

The new page doc/operations/observability/mcp_server.md covers:

  • Prerequisites.
  • Getting an Observability API key (used as the SIGNOZ-API-KEY header).
  • Finding the MCP endpoint on the Observability Setup page.
  • Connecting an MCP client.
  • The available tools.

It also links the new page from the Observability index and the API access page.

Related

A follow-up MR adds the MCP endpoint and a link to this page on the Observability Setup page. That MR depends on this one so the in-app help link resolves.

Author checklist

  • Documentation only; Vale passes with no errors.
  • Follows the documentation style guide.

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