This is a live headcount of how many LSPs currently have FRR protection actively in place. It gives an admin a fast way to judge blast radius -- how much traffic would immediately be affected -- if the underlying protected facility failed at this instant, which is a very different question from how many LSPs are merely eligible for protection. For example, a PLR reporting 27 here means 27 distinct label-switched paths would have their traffic redirected onto pre-computed backup paths the moment the protected link or node went down.