Fm > 92 roadie
There is a chirping sound coming from the front that goes away after i drive 5 or so miles.
From my experience, the 'chirping' sound has been the build up of very, very small amount of road dirt, which as been caught between the belt and pulley(*), being imbedded onto the pulley itself.
It'* the sound made when the embedded pulley/dirt,and the belt.. In the cases I've seen, I've used a putty knife on the pulley, to remove the 'smudge'.
As to the tensioner failing, I've found that the initial evidence will be, upon acceleration from a standstill, the weakness of the tensioner, results in the belt slipping -- that is not a 'chirping' sound, but a 'squealing sound', as you all, probably already know.