This is probably Android TV polling Jellyfin for new content for the Android TV home screen. IIRC, Android TV does this check every 5 mins, which lines up with your activity log.
Jellyfin 10.10.1 (Docker)
Ubuntu 24.04 LTS
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)