Net Retry% in ResNode Macros

Database
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Net Retry% in ResNode Macros

What, if any, values would be considered "normal" for the Net Retry % shown in the ResNode Macros? I am observing periods of up to four hours where the value is 10-20%, but I have no idea what to expect. Peak values hit 38% for short periods.

Observations are on a two-node 2555 running Teradata v12.

Any help/guidance will be greatly appreciated.