EPIPE error

2021-09-07T12:23:16: PM2 error: Error: write EPIPE
at ChildProcess.target._send (internal/child_process.js:839:20)
at ChildProcess.target.send (internal/child_process.js:710:19)
at sendHelper (internal/cluster/utils.js:27:15)
at send (internal/cluster/master.js:357:10)
at internal/cluster/master.js:323:5
at done (internal/cluster/round_robin_handle.js:55:7)
at RoundRobinHandle.add (internal/cluster/round_robin_handle.js:64:12)
at queryServer (internal/cluster/master.js:317:10)
at Worker.onmessage (internal/cluster/master.js:257:5)
at ChildProcess.onInternalMessage (internal/cluster/utils.js:48:5)
events.js:377
throw er; // Unhandled 'error' event
^

Error: write EPIPE
at ChildProcess.target._send (internal/child_process.js:839:20)
at ChildProcess.target.send (internal/child_process.js:710:19)
at sendHelper (internal/cluster/utils.js:27:15)
at send (internal/cluster/master.js:357:10)
at Worker.disconnect (internal/cluster/master.js:363:3)
at Worker.destroy (internal/cluster/master.js:376:10)
at Worker. (/app/.heroku/node/lib/node_modules/pm2/lib/God.js:258:30)
at Object.onceWrapper (events.js:520:26)
at Worker.emit (events.js:400:28)
at Worker.emit (domain.js:470:12)
Emitted 'error' event on Worker instance at:
at ChildProcess. (internal/cluster/worker.js:30:12)
at ChildProcess.emit (events.js:400:28)
at ChildProcess.emit (domain.js:470:12)
at internal/child_process.js:843:39
at processTicksAndRejections (internal/process/task_queues.js:77:11) {
errno: -32,
code: 'EPIPE',
syscall: 'write'
}

Use the reported stack trace as the starting point, then inspect pm2/lib/God.js around line 258 and the Node cluster worker-disconnect path on the reported Heroku setup. Done means the EPIPE failure is explained and addressed, with regression coverage for the affected worker lifecycle.