Look into further improving slack

[ylt]

• Message queuing + grouping (\n only, same user).
  • if past some threshold, group many users together, use an attachment per user message
• Only send next message once previous has been sent (combined with the queuing)
• On receiving side, Investigate using either
  • realtime api
  • or optimising outbound hook (keep connection open, re-use it to send a message from plug->slack)

Should reduce out of order messages, also should reduce total number of messages (and thus not remove as much slack chat history)