#927 (comment) So was the ScheduledExecutorService actually used in practice? I am trying to understand whether the key problem motivating #669

If we use a ClientManager per connection the thread usage [for ~150 connections] is way [too] high (10 schedule-exec threads + 1-2 worker-threads = ~1800 threads)

remains resolved even with this PR. I am currently investigating a rewrite to the built-in WS client since Tyrus 2.2.0 consumes far too many threads.

@jglick These ScheduledExecutorServices are used for PING-PONG heartbeat messages only.