We upgraded a Confluence instance to version 6.8.1 and are getting thousands of 500 server errors, which look like the below. Can you advise what is causing these errors and how to prevent them?
{ "_index": "_type": "nginx", "_id": "AWLIoO24uyZAlXugjbtC", "_score": null, "_source": { "request": "/visualweb/s/it_IT/7701/445126ab56584205167f1c035c86df495c7c4192/1.0/_/download/resources/confluence.web.resources:ajs/images/brand-images/programs/atlassian-developer-white.svg", "agent": "axios/0.17.1", "role": "ui", "auth": "-", "ident": "-", "type": "nginx", "rails_timestamp": "2018-04-15T09:26:50.000Z", "http_host": "cloudinary.com", "geo": "us", "request_time": "0.239", "rails": "false", "@version": "1", "cld_version": 414, "host": "host_ip": "x_cld_error": "-", "input_type": "log", "verb": "GET", "bytes_sent": "62346", "tags": [], "x_forwarded_for": "referrer": "-", "elb_ip": "10.0.2.179", "@timestamp": "2018-04-15T09:26:51.014Z", "instance_id": "request_length": "392", "response": "500", "bytes": "61806", "az": "httpversion": "1.1", "region": }, "fields": { "@timestamp": [ 1523784411014 ],
