https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#httprequest
- remoteIp
The IP address (IPv4 or IPv6) of the client that issued the HTTP request
- serverIp
The IP address (IPv4 or IPv6) of the origin server that the request was sent to
アクセス元のIPを確認したいときは、remoteIpを参照する。