Mapping of status codes to text

Question

I'd postponded this question because I thought I must have overlooked something. But I don't seem to be able to locate anything that deal with it.
I have a lot of metrics that return a integer value representing a certain status name. My MIB files map these numbers to text that explains the code. But the device will only respond with the code itself. How can I create that same map in the target metadata? So when I get code 1, I get a text string "Working" printed. And if the code is 2, I get "Error, no power", and 3 "Error, battery dead" etc. etc. A traditional switch statement.
COMPUTE_EXPR might help, but I don't know what functions it can handle. And I can't seem to find something like this in the samples? Is COMPUTE_EXPR documented somewhere?

Answer 1

You can add a COMPUTE_EXPR (as specified below) to do the mapping [where 'Last_Run_Outcome_Raw' is the raw/int value retrieved from the target, which needs to be mapped to a meaningful string value]
COMPUTE_EXPR="(Last_Run_Outcome_Raw == '0' ? 'Failed' : (Last_Run_Outcome_Raw == '1' ? 'Succeeded' : (Last_Run_Outcome_Raw == '2' ? 'Canceled' : (Last_Run_Outcome_Raw == '5' ? 'Unknown' : Last_Run_Outcome_Raw))))
There are various other uages of writing compute_expression, e.g., comparing, finding sub-set, etc. I will try to hunt out a related document and send it across.