linux-grsec became unsupported and was removed from the Arch Linux repositories, however I was unaware of this at the time and went for a little bit with an unsupported kernel on my system which is obviously a security risk to have such a core package not be supported any more.
But now I am concerned that there may be more packages like this that have been removed from the repositories and their support on my system ended which I am simply unaware of. So as
pacman does not appear to notify me about such packages installed on my system. I was wondering if there is a way to check if all currently installed packages are still available in the repositories and thus are still supported?
Obviously other than checking everything manually which would take ages.