Automatic Visibility/Observability

 View Only
  • 1.  Dropping of span information

    Posted Tue July 09, 2024 03:58 AM

    Hello all,

    putting higher load on my test system, I occasionally observe dropping of span information. By that I mean, that for comparable spans sometimes the whole information "is there" according to my instrumentation and sometimes not. 

    In this context I wanted to ask: If information is dropped, is it completely dropped? For example: If I want to make a statistic over all sql calls, calculating an average. And in one span less sql calls are registered, so a lower total number is recorded - can I trust the overall time given for the sql calls as being associated to the lower amount of calls? (I do that by filtering in one span for technology and choosing my db technology).

    Thanks in advance,

    Thomas



    ------------------------------
    Thomas Ruf
    ------------------------------


  • 2.  RE: Dropping of span information

    Posted Wed July 10, 2024 06:09 AM

    Hi Thomas,

    In my experience, those symptoms are related to our self-hosted edition and may indicate an issue with performance in your disks. If you have setup the backend based on the requirements then you should be safe, if not, this is an indicator that you need to have the right resources. Remember, we don't do sampling and we capture all.

    If everything is OK on your side in terms of resources, I suggest to contact our IBM Support team for further assistance.

    Regards,



    ------------------------------
    Israel Ochoa
    CSM Architect - Instana NCEE Market
    IBM
    Stockholm
    ------------------------------



  • 3.  RE: Dropping of span information

    Posted Fri July 12, 2024 02:15 AM

    Hello Israel,

    I am very positive, we have a SAAS endpoint and not a self-hosted edition. I just did not find the endpoint on the UI.

    But that is really not my concern here: Just assume, that there is information dropping. Maybe just like in an underprovisioned self-hosted edition. Can I trust the "reduced" information. So, e.g., only half of the sql calls are recorded, that I expect from the code, is the aggregated latency of thes sql calls correct and not referring to actually more.

    Thanks for your answer!

    Thomas



    ------------------------------
    Thomas Ruf
    ------------------------------



  • 4.  RE: Dropping of span information

    Posted Fri July 12, 2024 05:09 AM

    Ok, then you need to contact our IBM support and open a case with these details, our team will check your tenant and see if there is something wrong with it:

    https://www.ibm.com/mysupport/s/?language=en_US

    And yes, you can trust that data at some point but it will not be as accurate as getting ALL the data, the real Instana way, that's why we don't do sampling.

    Regards,



    ------------------------------
    Israel Ochoa
    CSM Architect - Instana NCEE Market
    IBM
    Stockholm
    ------------------------------