logBase in chart with 2 y-axes results in incorrect detection of yMaxLeft and yMaxRight

[markzabaro]

Apologies I can't share my testcase, the metric path is from work.

start with a chart that has a y-axis and a second y-axis: /render/?from=-24hours&width=1300&height=600&&lineWidth=2&target=aliasByNode(hourly.endpoints.*.wallclock.percentile_99,3,4,2)&target=secondYAxis(aliasByNode(hourly.endpoints.*.request_count,3,2))

add logBase=2 to the chart and it renders, but lots of things are different (beyond mere scaling of values and the labelling of the axes, which is the sole change I expect from adding this parameter).

What I observe:

• linear Base: previously left y axis had range from 0 to 700 and right y axis from 0 to 1250, with 5 lines visible across the entire timespan.
• log Base: left y-axis range is 8-128; right y-axis range is 1-256. only 3 lines visible across entire timespan. if i manually override yMaxRight and yMaxLeft to some value about the maximums autochosen in the linear scaled version, all lines are shown.

My guess is that the addition of logBase in a two y-axis scenario somehow interferes with default value detection for yMaxLeft and yMaxRight.