MikroTik RouterOS release channels and changelogs (upgrade.mikrotik.com)

https://upgrade.mikrotik.com/routeros/NEWESTa7.stable

Added 2026-10-03: first-party, plain-text and dated; NEWESTa7.stable / .long-term / .testing return '<version> <epoch>' and https://upgrade.mikrotik.com/routeros/<version>/CHANGELOG returns the release notes (verified 7.23.4 to 7.24.5). MikroTik labels silent security releases ('an important security update ... not currently publishing detailed information') and names CVEs only later, so it is the vendor-side ground truth for the RouterOS CVEs the store tracks. RECIPE: `python3 tools/fetch_source.py url --direct <URL>`. (2026-10-03T0404Z-intel) | health probe: NEWESTa7.stable returns only '<version> <epoch>', so the health check reads the 7.24 CHANGELOG instead (verdict relevant: 13.7k characters, 'security'); release notes are legitimately mostly non-security (general-news scope). (2026-10-03T0404Z-intel)