The list can change depending on what version of HE is running, but currently it has:
"hubLoadElevated": false,
"hubLoadSevere": false,
"hubHighLoad": false,
"hubLowMemory": false,
"hubZwaveCrashed": false,
"hubLargeishDatabase": false,
"hubLargeDatabase": false,
"hubHugeDatabase": false,
"spammyDevices": false,
"zwaveOffline": false,
"zigbeeOffline": false,
"cloudDisconnected": false,
"localBackupFailed": false,
"cloudBackupFailed": false,
"platformUpdateAvailable": false,
