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Posted to notifications@skywalking.apache.org by GitBox <gi...@apache.org> on 2021/05/20 08:31:40 UTC

[GitHub] [skywalking] JelfPann opened a new issue #6985: How to implement a metric which is computed by previous collected data?

JelfPann opened a new issue #6985:
URL: https://github.com/apache/skywalking/issues/6985


   Please answer these questions before submitting your issue.
   
   - Why do you submit this issue?
   - [ √] Question or discussion
   - [ ] Bug
   - [ ] Requirement
   - [ ] Feature or performance improvement
   
   ___
   ### Question
   - How to implement a metric which is computed by previous collected data?
   - For example, at time T, the JVM thread count is 10, and at time T-1, the JVM thread count is 5, 
    what I want to compute is the increment of the JVM thread count, which is 5 computed by 10 subtracts 5.
    We want to use the metric of the increment of the JVM thread count to do alarm behaviors.
   
   
   


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[GitHub] [skywalking] JelfPann commented on issue #6985: How to implement a metric which is computed by previous collected data?

Posted by GitBox <gi...@apache.org>.
JelfPann commented on issue #6985:
URL: https://github.com/apache/skywalking/issues/6985#issuecomment-846700257


   I do have learned ablout MAL as possible as I can. But I could just get a few of docs about it.
   Firstly, I am very confused of the Meter and Metric.
   In my debug practice, when JVM info of the agent received, only OAL works to process it. I can't find where the stream data go to the meter system.
   The config file `meter-analyzer-config/spring-sleuth.yaml` seems not working. 
   I do not know how the following scrpit works or whether it worked.
   ```
   expSuffix: instance(['service'], ['instance'])
   metricPrefix: meter
   metricsRules:
     - name: jvm_threads_live
       exp: jvm_threads_live
   ```


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[GitHub] [skywalking] wu-sheng commented on issue #6985: How to implement a metric which is computed by previous collected data?

Posted by GitBox <gi...@apache.org>.
wu-sheng commented on issue #6985:
URL: https://github.com/apache/skywalking/issues/6985#issuecomment-844862930


   MAL has a rate function for it.


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[GitHub] [skywalking] wu-sheng closed issue #6985: How to implement a metric which is computed by previous collected data?

Posted by GitBox <gi...@apache.org>.
wu-sheng closed issue #6985:
URL: https://github.com/apache/skywalking/issues/6985


   


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[GitHub] [skywalking] wu-sheng commented on issue #6985: How to implement a metric which is computed by previous collected data?

Posted by GitBox <gi...@apache.org>.
wu-sheng commented on issue #6985:
URL: https://github.com/apache/skywalking/issues/6985#issuecomment-846704155


   JVM metrics right now are only for OAL I am afraid. Unless you or someone contribute this and change it to MAL core, I don't think your requirement is possible.


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[GitHub] [skywalking] JelfPann commented on issue #6985: How to implement a metric which is computed by previous collected data?

Posted by GitBox <gi...@apache.org>.
JelfPann commented on issue #6985:
URL: https://github.com/apache/skywalking/issues/6985#issuecomment-844960818


   I have learned about 
   ```
   browser_app_error_rate = from(BrowserAppTraffic.*).rate(trafficCategory == BrowserAppTrafficCategory.FIRST_ERROR, trafficCategory == BrowserAppTrafficCategory.NORMAL); 
   ``` 
   but my case is different.
   In my case, only `ServiceInstanceJVMThread.liveCount` is used as the condition. I do not know how to compare with the past value.
   Could you show me a example?


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[GitHub] [skywalking] wu-sheng commented on issue #6985: How to implement a metric which is computed by previous collected data?

Posted by GitBox <gi...@apache.org>.
wu-sheng commented on issue #6985:
URL: https://github.com/apache/skywalking/issues/6985#issuecomment-844993949


   I think this is not available through OAL. All metrics should transfer into MeterSystem, and use MAL to run analysis. There is a `rate` function there.


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