Bot stuck in loop: "Heartbeat not answered properly."

[ZacharyTalis]

Issue: Bot was online but unresponsive, with the following message repeatedly appearing in the log:

[Javacord - Central Scheduler - 1] DEBUG org.javacord.core.util.gateway.Heart - Heartbeat not answered properly. This might be because of a busy websocket

The bot responded normally upon restart.

Proposed solution: (Somehow) detect that this issue has occurred, and restart the bot's container.

[glossawy]

This seems to be related to Javacord/Javacord#627, the simplest way I see to detect this is to see how long its been since DiscordApi#getLatestGatewayLatency was updated indicating time since the last heartbeat and restarting the bot if that exceeds some threshold. To be extra sure I would say if it exceeds 5 seconds. Maybe more.

[glossawy]

May eventually fix this so notes:

• Create a Pacemaker that checks that the DiscordApi heart is beating via checking against #getLatestGatewayLatency and disconnect and reconnect the bot
  • Require change to the DiscordBot interface to support a simple stop-then-start reconnect after a short delay
  • Threshold it at 5 seconds
  • Delay 5s between restarts
• Need some sort of alerting setup