How large is the Onion Space?

Description

How large the Onion Space actually is? This issue is about documenting what we know.

Tasks

• Document what is known about actual Onion Space size/occupation, perhaps at the Onion Space section:
  • In number of unique addresses: https://metrics.torproject.org/hidserv-dir-v3-onions-seen.html
  • In number of Onion Service directories: https://metrics.torproject.org/relayflags.png?flag=Running&flag=HSDir
  • The hashring size? Rough estimates (avg. and max): lowest/mid/highest estimations (25kB to 50kB per descriptor).
  • In bandwidth:
    • Current official numbers: https://metrics.torproject.org/hidserv-rend-v3-relayed-cells.html
    • Last time these stats were compiled (in 2015): Onion Services were 3% percent of total Tor traffic.
    • As of July 4th 2024, it seems to be 19.4% or all Tor traffic.
    • Thus, on 2024-07-04, 19.47% of client traffic is Onion Services traffic and 27.32% of traffic seen at a relay is Onion Services traffic.
    • What this is about, we don't know yet.
    • Recent analysis available at tpo/network-health/analysis#67 (comment 3079577)
  • In number of TLS certificates.
• Document and add it to the next "Some News From the Onion Space" bulletin (usually published here (example)).