disk space usage proposal

tsa/policy/tpa-rfc-4-prometheus-disk.mdwn

+Our Prometheus monitoring server is running out of space again. 6 months
+ago, we bumped it to 80GB in the hope that it would be enough to cover
+for a year of samples, but that turned out to be underestimated by about
+25%, and we're going to run out of space in a month if we don't take
+action.
+
+I would like to propose to increase this by another 80GB, which would
+cost 7EUR/mth. We have room in our discretionary budget for such an
+eventuality.
+
+This proposal is done in the spirit of our RFC policy:
+
+https://help.torproject.org/tsa/policy/tpa-rfc-1-policy/
+
+# Deadline
+
+Given that we will run out of space in 11 days if no action is taken, I
+propose a 7 days deadline for this proposal, which I will enact next
+tuesday if no one objects.
+
+# Status
+
+This proposal is currently in the `draft` state.
+
+# References
+
+See [[tpa-rfc-1-policy]].