Current Product Maintenance Question:

The sprint burn down chart is a publicly displayed chart
showing remaining work in the sprint backlog. Updated every
day, it gives a simple view of the sprint progress. It also
provides quick visualizations for reference. There are also
other types of burndown, for example the Release Burndown
Chart that shows the amount of work left to complete the
target commitment for a Product Release (normally spanning
through multiple iterations) and the Alternative Release
Burndown Chart,which basically does the same, but allows to
show clearly scope changes into a Release Content, by
resetting the baseline.