Running 6.43 stable, on cAP lite there is Health option under System in Winbox. cAP lite does not support Health monitoring as far as I’m aware so it should not be visible there. Opening it shows very small window with ‘OK’ ‘Cancel’ and ‘Apply’ options and no content.
Obviously Winbox GUI does not adapt completely to HW capabilities of connected device. Having such window for Health information is Winbox’ way of telling you that there’s nothing to be seen.
Actually Winbox is capable of adapting to hardware so long as it receives proper descriptors from device (they depend on RouterOS version, you can check roteros.jg in %appdata%\Mikrotik\Winbox for list of excluded devices for this particular menu). For example RB951G-2HnD is also missing health monitoring capability but acts properly and does not show Health under System (as per entry defined in descriptors).
Then again, this is just cosmetic issue of basically zero priority. This is more of a reminder to Mikrotik, so take it as bug report, not me asking for help.
(Speaking of which, 6.43 from stable channel is advertising itself as 6.43rc66 in descriptors)