APR represents the annual percentage rate of the last epoch the validator is elected. You can also get the data from the performance section on the validator page in staking dashboard website.
Uptime = signed blocks / to-sign blocks. There are two types of data, "None" or a number.
Based on the definition, if the validator is never elected, his uptime will show as None. In the staking dashboard, he will have empty result in the main page, and in the validator page, the uptime will be 0.00%.
There are five types of data in this field:
eligible to be elected next epoch
not eligible to be elected next epoch
Epos status is based on the validator's active status. The validator's active status will be controlled either by user or system (if detected low uptime or 0 self-stake). However if the validator is never elected, as long as he set the validator status as active, he will always be shown as "eligible to be elected next epoch".
There are five types of the data in this field:
NotBooted: if the validator was never selected/signed blocks.
None: when the validator is currently elected