Symptoms:
When trying to download usage data from a Usage Meter 4.4 appliance, the download fails with an internal server error. The following error appears in the Usage Meter nginx log files:
/opt/vmware/cloudusagemetering/var/nginx/logs/.
2021/11/01 05:13:26 [crit] 5267#0: *110892 open() "../umdata/NSX-T_Collection/2021/10/02/1870-1633163704026.zip" failed (24: Too many open files), client: XXX.XXX.X.XXX, server: localhost, request: "GET /api/v1/usage-data/2021-09?sessionid=UmSIDT60JlhznY/jod9iVPZp5zRsxjSNYL6sm37v2BlKVB38 HTTP/1.1", host: "XX.XX.XXX.XX", referrer: "https://XX.XX.XXX.XX/usage"