概括
我试图弄清楚如何|在 Prometheus 查询中正确使用 OR 运算符，因为我导入的 Grafana 仪表板不起作用。
长版
我正在尝试根据从运行AppMetrics/Prometheus的 Kubernetes pod 中抓取的一些数据来调试 Grafana 仪表板；仪表板在这里。基本上发生的情况是，当在serverGrafana 仪表板上选择“全部”的值时（server在这种情况下是单个 pod），不会出现任何数据。但是，当我选择一个单独的 pod 时，确实会出现数据。
这是从两个 pod 中抓取的相同指标的示例：
# 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 中运行查询检查器以找出它正在调用的查询，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
但是，当我尝试使用 PromQL 的|运算符来组合它们时，我没有取回数据：
rate(application_httprequests_transactions_count{env="test",app="MyApp",server="myapp-test-58d94bf78d-l9tdv|myapp-test-58d94bf78d-jdq78"}[15m])*60
这是 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] => []
我也为此打开了一个 GitHub 问题；它有一个快速的 GIF 屏幕录制显示我的意思：AppMetrics/Prometheus#43