UI: Dashboard IOPS graph fails to render
If the Dashboard UI isn't visible yet, e.g. you jump into workbench or graph, this can cause dygraph to not render it's graph. We need to use a similar strategy to PGMAP and force a rendering cycle. This is caused by canvas elements not being rendered correctly when they are outside of the current viewport.
How to reproduce:
1. enter manage -> enter graph -> enter dashboard
2. no iops graph is rendered
Take a look at pgmap and force a re-render when jumping back to dashboard.