probably a bug
estimated elo rating

why is it that i don't have this feature when reviewing my games? but most of the people i know have it even though they are also free, what should i do?
It had been a beta only feature and is being released site wide. When a new feature is released, it normally gets released to a percentage of members to make sure no bugs get reported.

Actually, it looks like it's been fully released. You will see it after any new Game Review run at the bottom of the game, after the last move. It may not be fully available yet on the apps.

Has the estimated ELO function been discontinued temporarily? I've been analysing games in my library, and recording the estimations to hunt for any signs of improvement, but over the last 3 or 4 days the estimated ELO section of the review just comes up blank (all the other features are working; I've only got a free account, in case that makes a difference)?

I haven't been getting estimations all day, while getting them all the time.
It was a bug and has now been fixed.

The estimation it was giving initially was generally way too high. A little while back, when I posted above, is around when they changed it. In order for it to produce an estimated ELO, you need to have the ELO of at least one of the players. Games played on Chess.com will include this information, so it should work. However, if you upload a game that you played over the board, or against a computer elsewhere, etc, you need to add that information to the PGN file. It's not hard to do as PGN files are just text files. So, just enter your Chess.com rating in the header information by adding the following Tag (if you're playing the white pieces ):
[WhiteElo "800"]
if you're playing the black pieces, then it would be
[BlackElo "800"]
Save your pgn, and then upload it and you should get estimated ratings again.
why is it that i don't have this feature when reviewing my games? but most of the people i know have it even though they are also free, what should i do?