On action "Frontend websocket error" with auction was received message: "Unknown error"

http_status_code 504 prozorro-prod 7 times

Pod

[2021-09-27T10:09:24.879Z] | aiohttp.access | INFO - "88.155.87.136 POST /api/auctions/SUE001-UA-20210828-65560/log HTTP/1.1 204 252 https://auction.prozorro.sale/SUE001-UA-20210828-65560 Mozilla/5.0 (iPhone; CPU iPhone OS 14_7_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1.2 Mobile/15E148 Safari/604.1 0.001000" | AUCTION-ID: SUE001-UA-20210828-65560 | X-Request-ID: af1a894c816eeeb6a1c665bf73a622b5

 [2021-09-27T10:10:22.813Z] | frontend | ERROR - On action "Frontend websocket error" with auction LLE001-UA-20210825-21318 was received message: "Unknown error" | AUCTION-ID: LLE001-UA-20210825-21318 | X-Request-ID: 31978ef7f026f6cc7d0dac3be95f0bef

  Sep 27, 2021 @ 10:38:28.017 [2021-09-27T07:38:28.017Z] | frontend | ERROR - On action "Frontend websocket error" with auction LLE001-UA-20210825-21318 was received message: "Unknown error" | AUCTION-ID: LLE001-UA-20210825-21318 | X-Request-ID: 65d256c66c9409b68bc7958a492f32ec '''

message:[2021-09-27T10:25:07.833Z] | frontend | ERROR - On action "Frontend websocket error" with auction SUE001-UA-20210828-65560 was received message: "Unknown error" | AUCTION-ID: SUE001-UA-20210828-65560 | X-Request-ID: b17214745a731d6a4bcfde48d2fec5ae agent.type:filebeat agent.id:2b0f242f-5a56-4a31-825e-0ba710164e2b agent.version:7.5.1 agent.ephemeral_id:41c48017-6534-4a58-b0e0-dfc48e26fada agent.hostname:worker-node-2-prod log.offset:5,552,256 log.file.path:/var/log/containers/prozorro-prod-prozorro-sale-auction-api-7cf6748648-