Radar: connect with agents

[kaitlynmichael]

Note

Low Risk
Documentation-only changes with no application code, credentials handling, or deployment logic modified in this PR.

Overview
Documents Radar agents for Redis Software and Redis Open Source when Radar cannot reach clusters directly (firewalls, private subnets, air-gapped paths).

Adds agent.md, a new operate guide that explains managed vs static credential modes, tarball install and systemd setup, managed activation and static YAML provisioning, private CA trust, isolated-network export/submit-export, monitoring (/healthz, /metrics), security notes, and upgrade/removal. It references new UI screenshots under images/radar/.

Updates _index.md and connect.md so network reachability is called out as a setup requirement, with links to the agent page when direct outbound access from Radar is not possible.

^{Reviewed by Cursor Bugbot for commit 2bf5eaa. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

DOC-7023

[github-actions]

Staging links:
https://redis.io/docs/staging/DOC-7023/operate/radar/
https://redis.io/docs/staging/DOC-7023/operate/radar/agent
https://redis.io/docs/staging/DOC-7023/operate/radar/agent/
https://redis.io/docs/staging/DOC-7023/operate/radar/connect/

[github-actions]

🧠 Redis Memory

Found 9 related items from repository history (1 new this commit):

• Commit — remove connection

  remove connection

• Commit — review feedback

  review feedback

• Commit — Update content/operate/radar/connect.md

  Update content/operate/radar/connect.md

• Commit — add screenshots

  add screenshots

• Commit — first use edit

  first use edit

• PR — Radar docs

• Commit — Revalidate Radar pages against v0.3.21

  Revalidate Radar pages against v0.3.21

• Commit — edits and questions

  edits and questions

• Commit — add in missing info 🆕

  add in missing info

Memory updated at 2bf5eaa

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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^{Reviewed by Cursor Bugbot for commit 9251adf. Configure here.}

[dwdougherty]

Apart from the Bugbot issue and the TODO you have in a comment, the language looks good to me. One nitpick: the first image, activate-managed-agent.png could do with a bit of trimming.