Steps to reproduce:

1. Create a trapper number item

1. 1. Others work but this makes it easier
2. In a dashboard

1. 1. Create a widget as a graph with:
      1. That metric as dataset
      2. Draw: Line
      3. Missing data: Connected
      4. 
         Aggregation function: None
      5. [other graph options don't really matter here]
2. Submit very different values over time using zabbix_sender. Here's an example:

1. 1. At second 0: 0
   2. At second 5: 5000
   3. At second 60: 5000
   4. At second 65: 0
   5. At second 290: 0
   6. At second 300: 300
   7. At second 500: 300
   8. At second 510: 0
   9.  
2. See the graph at different time intervals

Result:

You see the graph overreaching all this time interval:

But if I zoom in into that interval:

Actually, only that tiny interval had red that high with a second spike:

If you think

And if I zoom at the actual location:

That is what I get.

So, the data is correct, it's the graph, when zoomed out, that is plotting incorrectly.

The graph was visually growing into a new value when actually there was a 0 value before the high value.

These graphs seem very "free-flowing" because they are measuring a very (metrics-wise) very chaotic but important system in our infrastructure that turns off periodically by design (I wish I could be more specific but NDA limits a lot what I can share)

Expected:

No aggregation to happen in the graphs and no disagreement between the zoomed out and zoomed in graphs when aggregation is set to "None".

I understand the space issues. When those exist, do not just choose the latest value for no aggregation. Instead, when drawing, it may make sense to push a value ever so slightly to the left so those visual bridges aren't visible.

 

Alternatives tried:

Different Draw option

1. Points:
   1. They are too hard to see given our needs and their position
2. Staircase:
   1. I initially thought of this one as ideal but it turns the "bridging" effect much more severe and even harder to spot.
3. Bar:
   1. The bars are so thin I can't really look and analyze what I'm seeing.