Version check and 426

Outdated clients can be refused. Here is how to check ahead of time.

1. 01

   Ask for the version on start

   version needs no auth and is cached for 5 minutes. Ask again every 12 hours.

   GET /api/plugin/v1/version
2. 02

   Read the response

   latest, minimum, downloadUrl. Unknown values are null.

   {"latest":"1.2.2","minimum":null,"downloadUrl":"https://…"}
3. 03

   Handle 426

   If pluginVersion is below minimum, claim and report are refused with 426. Point the operator at downloadUrl.

   {"error":"plugin_outdated","minimum":"1.2.0","downloadUrl":"https://…"}
4. 04

   Comparison rule

   Numeric major.minor.patch comparison. A leading v and any -suffix are ignored. A missing pluginVersion is never blocked.