The Availability column aims to ease the purchase of a device that is supported by OpenWrt.
It does not aim to flood the user with results that might once have been available, and google is your friend to find out real availability. It does also not aim to put the user through the ordeal to hunt down a single leftover device at ebay.nz when he is living in the EU which has been discontinued according OEM information.
Data quality of this column is certainly an issue. But as always when it comes to maintenance, the community is reluctant to actually do something and check outdated availability information.
In order to track unknown or available status, I added the year at which the status has been set.
The data is only as good as the community makes it. Since rarely someone else ever checks this column, even if requested to do so (see https://forum.openwrt.org/viewtopic.php?pid=347510), it's up to me to do the dirty work.
My process for checking availability: https://forum.openwrt.org/viewtopic.php?pid=347531#p347531
In general, I try to find official EOL information at the OEM, but only few OEMs have good data on this subject.
If that's not available, I try to find the device at amazon.de/.com/.uk (need to check more than one!) or other local well known suppliers. If you can't buy it "new", then it might be EOL / Discontinued.
If that leads to no result, try at dx.com or something like this.
The essence of this: Try different sources in different countries.
US/EU/CN: I don't care about "sold only in....". If the device is available $somewhere, it is available.
No, but neither can we make sure that all other information contained in the dataentries is 100% correct all the times.
The data is only as good as the community makes it.
That's not a problem, since the user will then certainly try to buy it, notice that he can not buy it anywhere in this galaxis, and go on to the next (needless to say without updating the dataentry accordingly...).
In addition to this: I mentioned the year being included in the availability status. This is a marker, that devices with year < current year should be checked when doing maintenance of the data, i.e. everything lower than "Available 2017" should be checked and updated now.
Feel free to create a new one and name it suitably.
Also, feel invited to check correctness of availability information via https://lede-project.org/toh/views/toh_admin_available
I could really need some help with this tedious task.
P.S. #1: I found out why the Nexx3020H wasn't shown in the toh_admin_available: https://wiki.openwrt.org/toh/hwdata/nexx/nexx_wt3020h shows this one as "Available", and during import of the dataentries, I changed this undetermined statement to something more up to date, i.e. "Available 2016?" (note the question mark). However, I forgot to add this new value to the field aliases, which made the availability field look blank (but in the dataentry the "Available 2016?" was still in). I updated the field alias, and now the 3020h shows up correctly.
In addition to this, I updated the availability field now in general: removed blank fields and ¿ by filling them with "unknown 2017".
P.S. #2: A list of suppliers to check for availability could help to improve dataquality.