caddy/caddytest/integration/caddyfile_adapt/global_options_log_custom.txt

{
	log custom-logger {
		format filter {
			wrap console
			fields {
				request>remote_ip ip_mask {
					ipv4 24
					ipv6 32
				}
			}
		}
	}
}
----------
{
	"logging": {
		"logs": {
			"custom-logger": {
				"encoder": {
					"fields": {
						"request\u003eremote_ip": {
							"filter": "ip_mask",
							"ipv4_cidr": 24,
							"ipv6_cidr": 32
						}
					},
					"format": "filter",
					"wrap": {
						"format": "console"
					}
				}
			}
		}
	}
}