夜莺转发时序数据时如何使用 relabel 功能

[[Writers]]
Url = "http://127.0.0.1:9090/api/v1/write"
# Basic auth username
BasicAuthUser = ""
# Basic auth password
BasicAuthPass = ""
# timeout settings, unit: ms
Headers = ["X-From", "n9e"]
Timeout = 10000
DialTimeout = 3000
TLSHandshakeTimeout = 30000
ExpectContinueTimeout = 1000
IdleConnTimeout = 90000
# time duration, unit: ms
KeepAlive = 30000
MaxConnsPerHost = 0
MaxIdleConns = 100
MaxIdleConnsPerHost = 100
# [[Writers.WriteRelabels]]
# Action = "replace"
# SourceLabels = ["__address__"]
# Regex = "([^:]+)(?::\\d+)?"
# Replacement = "$1:80"
# TargetLabel = "__address__"

const (
	Replace   Action = "replace"
	Keep      Action = "keep"
	Drop      Action = "drop"
	HashMod   Action = "hashmod"
	LabelMap  Action = "labelmap"
	LabelDrop Action = "labeldrop"
	LabelKeep Action = "labelkeep"
	Lowercase Action = "lowercase"
	Uppercase Action = "uppercase"
)

[[Writers.WriteRelabels]]
Action = "drop"
SourceLabels = ["env"]
Regex = "^test$"