使用rate()时的Prometheus或

Question

摘要

我试图在Prometheus查询中正确使用OR |操作符，因为导入的Grafana仪表板无法工作。

长版本

我正在尝试根据运行AppMetrics/Prometheus的Kubernetes吊舱中的一些数据调试Grafana仪表板；仪表板是这里。基本上，当在Grafana仪表板上选择server的"All“值时(在本例中，server是一个单独的pod )，就不会出现任何数据。然而，当我选择一个单独的吊舱时，数据就会出现。

下面是从两个豆荚中刮出的相同度量的一个例子：

# HELP application_httprequests_transactions 
# TYPE application_httprequests_transactions summary
application_httprequests_transactions_sum{server="myapp-test-58d94bf78d-jdq78",app="MyApp",env="test"} 5.006965628
application_httprequests_transactions_count{server="myapp-test-58d94bf78d-jdq78",app="MyApp",env="test"} 1367
application_httprequests_transactions{server="myapp-test-58d94bf78d-jdq78",app="MyApp",env="test",quantile="0.5"} 0.000202825
application_httprequests_transactions{server="myapp-test-58d94bf78d-jdq78",app="MyApp",env="test",quantile="0.75"} 0.000279318
application_httprequests_transactions{server="myapp-test-58d94bf78d-jdq78",app="MyApp",env="test",quantile="0.95"} 0.000329862
application_httprequests_transactions{server="myapp-test-58d94bf78d-jdq78",app="MyApp",env="test",quantile="0.99"} 0.055584233

# HELP application_httprequests_transactions 
# TYPE application_httprequests_transactions summary
application_httprequests_transactions_sum{server="myapp-test-58d94bf78d-l9tdv",app="MyApp",env="test"} 6.10214788
application_httprequests_transactions_count{server="myapp-test-58d94bf78d-l9tdv",app="MyApp",env="test"} 1363
application_httprequests_transactions{server="myapp-test-58d94bf78d-l9tdv",app="MyApp",env="test",quantile="0.5"} 0.000218548
application_httprequests_transactions{server="myapp-test-58d94bf78d-l9tdv",app="MyApp",env="test",quantile="0.75"} 0.000277483
application_httprequests_transactions{server="myapp-test-58d94bf78d-l9tdv",app="MyApp",env="test",quantile="0.95"} 0.033821094
application_httprequests_transactions{server="myapp-test-58d94bf78d-l9tdv",app="MyApp",env="test",quantile="0.99"} 0.097113234

我在Grafana中运行了查询检查器，以找出它正在调用哪个查询，然后在Prometheus本身中运行PromQL查询。基本上，当我单独执行以下PromQL查询时，它们会返回数据：

rate(application_httprequests_transactions_count{env="test",app="MyApp",server="myapp-test-58d94bf78d-l9tdv"}[15m])*60

rate(application_httprequests_transactions_count{env="test",app="MyApp",server="myapp-test-58d94bf78d-jdq78"}[15m])*60

然而，当我尝试使用PromQL的|运算符组合它们时，我没有得到数据：

rate(application_httprequests_transactions_count{env="test",app="MyApp",server="myapp-test-58d94bf78d-l9tdv|myapp-test-58d94bf78d-jdq78"}[15m])*60

以下是Grafana查询检查器的原始输出：

xhrStatus:"complete"

request:Object

method:"GET"
url:"api/datasources/proxy/56/api/v1/query_range?query=rate(application_httprequests_transactions_count%7Benv%3D%22test%22%2Capp%3D%22MyApp%22%2Cserver%3D%22myapp-test-58d94bf78d-jdq78%7Cmyapp-test-58d94bf78d-l9tdv%7Cmyapp-test-5b8c9845fb-7lklm%7Cmyapp-test-5b8c9845fb-8jf7n%7Cmyapp-test-5b8c9845fb-d9x5c%7Cmyapp-test-5b8c9845fb-fw4gj%7Cmyapp-test-5b8c9845fb-vtl9z%7Cmyapp-test-5b8c9845fb-vv7xv%7Cmyapp-test-5b8c9845fb-wq9bs%7Cmyapp-test-5b8c9845fb-xqfrt%7Cmyapp-test-69999d58b5-549vd%7Cmyapp-test-69999d58b5-lmp8x%7Cmyapp-test-69999d58b5-nbvt9%7Cmyapp-test-69999d58b5-qphj2%7Cmyapp-test-6b8dcc5ffb-gjjvj%7Cmyapp-test-6b8dcc5ffb-rxfk2%7Cmyapp-test-7fdf446767-bzhm2%7Cmyapp-test-7fdf446767-hp46w%7Cmyapp-test-7fdf446767-rhqhq%7Cmyapp-test-7fdf446767-wxmm2%22%7D%5B1m%5D)*60&start=1540574190&end=1540574505&step=15"

response:Object

status:"success"

data:Object

resultType:"matrix"

result:Array[0] => []

我还为此打开了一个GitHub问题；它有一个快速的GIF屏幕记录，显示了我的意思：AppMetrics/Prometheus#43

Answer 1

|用于正则表达式，PromQL没有|运算符(但它有or运算符)。您需要指定匹配器是正则表达式，而不是与=~完全匹配的

rate(application_httprequest_transactions_count{env="test",app="MyApp",server=~"myapp-test-58d94bf78d-l9tdv|myapp-test-58d94bf78d-jdq78"}[15m])*60