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Wrong Plot on Stat Panels for DB Conns and Disk Reads at Home Dashboard

Description

User Impact: Wrong representation of data on Home Dashboard, could create confusion to end user

It seems with 2.27.0 we have some glitches in the way we show DB Conns and Disk Reads, if you observe the attached image

 

You will observe 2 issues:

1) "DB Conns" shows lots of lines for "All", yet only the single metric value for the individual hosts?

2) "Disk Reads" in this chart show lines with 0B/s? (this is something I have seen in the previous versions too)

 

STR:

1) Open PMM 2.27.0 Home Dashboard, and observe the values on the stats panel for the above two metrics. 

How to test

None

How to document

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Attachments

5
  • 05 Apr 2022, 02:39 PM
  • 05 Apr 2022, 02:38 PM
  • 05 Apr 2022, 02:34 PM
  • 05 Apr 2022, 02:22 PM
  • 05 Apr 2022, 06:44 AM

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Anton Bystrov January 23, 2023 at 10:40 AM

Can't reproduce this issue at new Home Dashboard.

duygu.aksoy September 23, 2022 at 11:57 AM

I suggest to close this ticket if you don't see similar issues on new Home dashboard?  I think no need to invest our time for the dashboard that we're gonna archive? 

Anton Bystrov April 5, 2022 at 2:41 PM

I tried to reproduce this issue:

About spike in "Disk Reads": digits show us current value and graph show, that some time ago we have spike of this metrics (spike of read operations). About "saw" at DB Conns graphs I can't to reproduce it.

About "0" in disk operation. iotop at instance also show "0" disk read operations:


Diskstats show:


Field 4 "reads completed successfully" has changes rare. Data from this field contains in formula panel "Disk Reads"

Cannot Reproduce

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Needs Doc

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Regression Issue

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Created April 5, 2022 at 6:43 AM
Updated March 6, 2024 at 1:23 AM
Resolved January 23, 2023 at 10:40 AM

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