Hello Dojo,

I'm looking for a clarification in terms of trend behaviour normally implemented in DM connectors: when is a vertical line added in trend graphs between values?

Typically, if an element is in timeout, a gap is presented in trend graphs as no data was being polled for the
duration of the timeout (No line connecting the discontinuity, this is well known and expected behaviour in DM).

At times, a "Not Available" (typically "-1" mapped as "Not Available") can be defined
e.g. in case a process disappears: would this present the same gap as a timeout (no vertical line)?

Or would this need to produce a vertical line down to a "Not available" on the Y-axis?

Asking in the context of "exception values" too, e.g. all those values that any polled device can use to signal a state that is not a valid measurement, such as:

• Large constants used as “out-of-range” placeholders

  • 9999, 65535, 2147483647, -999

• Special strings

  • "N/A", "Not Available", "Invalid", "Unknown"

• Hex values

  • 0xFFFF (often used in SNMP MIBs to indicate no value)

Trying to streamline the behaviour for different connectors & cases from different vendors - any steer will be helpful.