To identify the full URL used by a referrer domain (where available), run the following Flux
import "strings"
// Set this to the referrer domain to search for
domain = "github"
from(bucket: "telegraf/autogen")
|> range(start: -7d)
|> filter(fn: (r) => r._measurement == "pf_analytics_test")
|> filter(fn: (r) => r._field == "referrer")
|> filter(fn: (r) => strings.containsStr(v: r._value, substr: domain))
|> group()
|> drop(columns: ["_field", "_measurement", "host"])