'total' literal not correct for Gauge Calculation

[ssmcgrat]

grafanalib/grafanalib/core.py

Line 278 in ff156bb

GAUGE_CALC_TOTAL = 'total'

Howdy, I believe GAUGE_CALC_TOTAL = 'total' needs to be changed to GAUGE_CALC_TOTAL = 'sum'. The literal 'total' fails to define the Calculation value for a bar gauge, 'sum' literal has worked for me (using grafanalib 0.7.0)

[davaffy]

I can confirm this:

This can also be seen here where total is set to sum.

https://github.com/grafana/grafana/blob/71b841fa9bfbc02f40f23a98d0490577603aba02/packages/grafana-data/src/transformations/fieldReducer.ts#L172

I've used this case to create my first pull request (because it was an easy one)