What are the various denial of service vectors on the Lightning Network?

Question

What are the various denial of service (DoS) vectors on the Lightning Network?

Answer 1

This is a draft answer. Alternative answers (as always) are welcome.

Alex Bosworth listed a number of DoS vectors on Twitter. This isn't necessarily an exhaustive list.

• TCP level flooding
• P2P protocol flood
• Too-many graph updates
• Huge unsettled HTLCs
• Many slow HTLCs
• Pathfinding distraction
• RBF pinning
• 0-Base PPM floor HTLCs
• Many channel open proposals
• Fake Neutrino data
• KeySend spam