Old URL releases are not removed #625
Description
How to reproduce (e.g Puppet code you use)
Use $install_method = 'url' and update $version in any exporter.
What are you seeing
If you do this a few times, it can lead to the following:
177.5 MiB [##########] /prometheus-2.28.1.linux-amd64
162.0 MiB [######### ] /prometheus-2.24.1.linux-amd64
159.9 MiB [######### ] /puppetlabs
158.7 MiB [######## ] /prometheus-2.23.0.linux-amd64
157.9 MiB [######## ] /prometheus-2.22.0.linux-amd64
157.4 MiB [######## ] /prometheus-2.21.0.linux-amd64
150.0 MiB [######## ] /prometheus-2.20.0.linux-amd64
147.1 MiB [######## ] /prometheus-2.19.0.linux-amd64
145.1 MiB [######## ] /prometheus-2.18.1.linux-amd64
139.6 MiB [####### ] /prometheus-2.17.2.linux-amd64
137.7 MiB [####### ] /prometheus-2.16.0.linux-amd64
50.4 MiB [## ] /alertmanager-0.21.0.linux-amd64
18.8 MiB [# ] /node_exporter-1.0.1.linux-amd64
17.7 MiB [ ] /node_exporter-1.2.0.linux-amd64
17.4 MiB [ ] /blackbox_exporter-0.19.0.linux-amd64
16.3 MiB [ ] /blackbox_exporter-0.16.0.linux-amd64
16.1 MiB [ ] /node_exporter-0.18.1.linux-amd64
What behaviour did you expect instead
I would expect the old no longer used releases to be removed in order not to consume unnecessary resources.
Any additional information you'd like to impart
To achieve this I have created a directory under /opt which can be purged. There are other ways, but I
found this the cleanest.