"login" refers to the record of access¹, not the access itself, so it is more properly associated with audit. This dates from the early days² of time-sharing systems when you didn't need a password, you were just saying hi to the computer.

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[1] Derived from the signing of a ship's logbook³ when coming aboard.

[2] A few decades ago.

[3] The logbook originally⁴ recorded navigational data and is named for instruments measuring speed through water⁵, of which the simplest is literally throwing roped wooden logs off the stern and counting the knots on the line paying out per interval⁶.

[4] Doubtless some bright-eyed young hornblower with a glittering future career as an admiralty archivist realised that log-structured records could be generalised usefully to all timestamped event and measurement capture, which is why your syslog is full of crap.

[5] Consequently any vessel, maritime or otherwise, measures its speed through the medium in knots. The Enterprise NCC-1701-D, for example, tops out ca.146 megaknots under impulse engine.

[6] It follows by transitive etymology that you may use the term "knots" to edify and delight your colleagues when referring to the rate of creation of user sessions.