Even in the above post some games are listed as having the best price in 3 years, and in other previous posts it was 5 or 2 years, so there are notifications in those cases. About the highest percentage discount vs. lowest actual price though, that depends on how the script's set up I guess, assuming that one is used.
Now the OP's intent, as specified in the OP as well, was to just include lowest ever prices, in absolute value, so not highest percentage discounts when the base price may change and without a time threshold. But contributors, and g2222 is clearly the main one, may decide to include other things they deem relevant in their lists.

It's defined by that particular version (Remastered versions that replace classic versions like Doom 1+2 usually get their own domain, so even if their new highest discount is more expensive than an earlier discount of the classic version, it doesn't matter) having it's highest discount since it's up on the site without newsletter exclusive discounts. You can look up every sale of those games on certain websites (including GOG) on isthereanydeal!

Edit: So something like the bundle you mentioned isn't counted into the equation. That's why they sometimes post additional info about it having been cheaper in a different version.

The Uprising games haven't been remastered. They were just sold cheaper in the past. Look up the old prices on GOGDB. And I do think that bundles count as well if they contain the full games. What's the point of buying a single game if a bundle containing it is cheaper?

1. Yes, they were cheaper. 5 years ago. Now, with their new pricing, that's the lowest they have been.
2. I don't think you understood my point. Bundles are listed by themselves. So, every single listed item in this store has it's own "all-time high discount". Some people don't want to buy a whole bundle, cause they already have some or even most of the titles included. That's the sole reason why I haven't bought the Shadow Tactics bundle even though it is obviously way cheaper than getting each included game and dlc.

I understand that the term "all-time high discounts" might raise some expectations which, in the end, I will not be able to meet. So let me provide some explanations of how I work:

1) Yes, my work relies on a bit of scripting and automated price retrieval. However, my own data basis begins only in May of this year. I do manual(!) validation against Gogdb but that is usually limited to a time frame of >= 2021 as well. (I haven't tried to validate against IsThereAnyDeal yet. If time permits I'll explore that in the future.)

2) I only consider GOG's own catalog and prices. HumbleBundle, Fanatical, Amazon or other cooperations are outside my scope.

3) Sadly I will not be able to match the prices and contents of bundles/collections/editions against individual games/dlcs/products. You'll always need to do these comparisons yourself.

The final decision whether a discount is included in my posts (or not) is entirely my own. I do not and will not blindly post auto-generated lists. Each entry is checked whether it provides some benefit to the community. Sometimes I make exceptions to the "all-time" rule, for example for first-time repeats, limited-time flash deals, games that are fresh out of Early Access, or after longer dry runs without new prices.

I understand this thread as a kind of news-feed. In that spirit, I report the interesting price changes to the best of my knowledge. I cannot give any guarantees ("best-price-or-money-back") nor can I provide recommendations. And finally: I'm only human and errors may sneak into my posts. Also, the time I'm willing to spend on this is limited. Working harder is no option, only working smarter. ;-)

Just wanted to take the opportunity to thank you for the effort.
And wow, was thinking that it was at least in good part automated. Even more impressive if done manually!

I would also like to very much thank g222 (manually, wow!) and matterbandit, as well as other contributors, for all their considerable time and hard work starting this thread and keeping it current. (Including the 'tick-tock timely' alerts!) For my part and especially with the way prices have gone everywhere, I only care about the past 3-5 years or so, and if I really want I can check GogDB myself once this thread has drawn my attention to a certain game. It is very much appreciated, especially by myself who keeps an eye on it for Donating, Gifting and future Give-Aways. I would say 'Hats Off to You," but I don't wear hats ... so BIG THANKS! will have to do. :)

Please, let's keep this thread in the manner which I believe matterbandit intended; which I believe was to be helpful to the community by alerting us to the best prices/highest discounts within a reasonable many year time period as could be reasonably found and verified without having to check every Gog code, game iteration and bundle. IMHO those things should be for each of us to do (if we're truly interested) once we've been first clued in by this wonderfully helpful thread and all the hard work predone for us by the contributors.

1000%!

I'll wait for another deep cut of the price like Astria Ascending DX had before this.

I just want to chime in with an appreciation for every contributor to this thread :) Special shout out to g2222 and matterbandit! It saves me, and probably many others too, so much time every time there's a sale. Thank you! :)

As Cavalary pointed out a couple of posts above, it is true that when I launched this thread, it was with the intent of focusing on lowest ever store prices. My intent was to stand apart from the other discount/sales threads and to offer an additional yet different thread for members to consult when deciding whether or not to purchase a game. And, I still want us to continue to keep that same focus, as a "guiding light" so that this thread retains its purpose and its spirit, that many of us have come to like and find useful. :)

Having said that, I do take the time to verify the deals that are posted here by individual contributors, but admittedly, as g2222 is our platinum contributor, there's simply too much content for me to sift through and so I've come to trust g2222's contributions fully. Behind the scenes, I was made fully aware of g2222's scripting magic and all of his manual efforts, often to check whether the deals provide some benefit to the community. I've always admired that he does not blindly post auto-generated lists, to be honest. ;) And when g2222 does decide to stray a little for a specific deal, he remains completely transparent about it, posting indicators such as "best price since 3 years" or "price is not strictly new" or whatever.

In short, I am very happy with how this thread is going. I'm glad that many find it useful and I'm always grateful of those who take the time to contribute their findings. Is it perfect? Nope. Will errors pop up now and then? Absolutely.

If there's a "bad boy" around here, it's definitely me! xD Been busy with my 10th Anniversary thread and now I'm running so far behind here with keeping the overview list up-to-date, that I am red-faced with shame. :P

I would like to agree, I think this thread is quite useful. :-)

^100% this! I’ve come to check this thread nearly every sale now, just to see if there’s any new all time lows to check out! Thank you to all contributors for your hard work in keeping up and maintaining this thread!

The log chops the log is ticking https://www.gogdb.org/changelog the active GOG the clock is watched
the watch is clocked the log is chopped..... I.... yes thank you! ^ : )

new promotions any minute
last deal 22hrs ago [url= ]https://isthereanydeal.com/deals/#sort:-time;filter:N4IgzgFg9gDmIC4DaBmArAXQL5A=;options:all[/url]
Or 18hrs ago who knows https://gg.deals/deals/?minRating=0&sort=date&store=10

Have a good fun in luck!