我有一个设备将温度测量结果公开为 JSON,格式如下:
[
{
"dataPointId": 123456,
"values": [
{
"t": 1589236277000,
"v": 14.999993896484398
},
{
"t": 1589236877000,
"v": 14.700006103515648
},
{
"t": 1589237477000,
"v": 14.999993896484398
},
[..]
如您所见,这些值包含时间戳和温度测量值。我想通过 Prometheus 指标公开这些测量结果,所以我使用prometheus/client_golang
建立一个出口商。
我的期望是/metrics
然后端点从上面的数据中暴露出类似的内容:
# HELP my_temperature_celsius Temperature
# TYPE my_temperature_celsius gauge
my_temperature_celsius{id="123456"} 14.999993896484398 1589236277000
my_temperature_celsius{id="123456"} 14.700006103515648 1589236877000
my_temperature_celsius{id="123456"} 14.999993896484398 1589237477000
我实现了一个简单的prometheus.Collector
我添加静态指标没有任何问题。对于上述测量,NewMetricWithTimestamp
似乎是添加带有时间戳的指标的唯一方法,因此我使用如下方式迭代这些值:
for _, measurements := range dp.Values {
ch <- prometheus.NewMetricWithTimestamp(
time.Unix(measurements.T, 0),
prometheus.MustNewConstMetric(
collector.temperature,
prometheus.GaugeValue,
float64(measurements.V),
device.DatapointID))
}
但是,这会导致以下我不完全理解的错误:
An error has occurred while serving metrics:
1135 error(s) occurred:
* collected metric "my_temperature_celsius" { label:<name:"id" value:"123456" > gauge:<value:14.999993896484398 > timestamp_ms:1589236877000000 } was collected before with the same name and label values
* collected metric "my_temperature_celsius" { label:<name:"id" value:"123456" > gauge:<value:14.700006103515648 > timestamp_ms:1589237477000000 } was collected before with the same name and label values
[..]