Running Total Burndown

Hi,

from the screenshot you have provided here are my thoughts about it

1. A cumulative total, month-over-month. - your line seems to be correct because i can only see Feb and march in resolved column 
2. Show all the months of the year even if we don't have any data for future months. - there are blank months so i can see you got that right as well
3. For future months, don't show a flat line, don't show any line. Show only up until current month basically.- for this you will need to do the following 
   create a new dax calculated column in date table which it says if it part of this month or before 

NewColumn = IF([Date] <= EOMONTH(TODAY(), 0), "Yes", "No")
​

and filter the yes only (SS is a sample i tested not your data)

• Filter for issues that have status of Done.
  you can simply drag and drop status column to filters and filter only done 
  

   

• Start from target number (i.e 40) and burn down to zero. - i can see a burning down in your sample line chart , so i feel like you got that right as well 

thegreenoz ,
try this,

Burndown_Chart =
VAR MaxResolvedDate =
MAX ( 'JIRA_CICD'[Resolved] ) -- Get the latest resolved issue date
VAR TargetValue = 40 -- Set your starting target value
VAR IssuesResolved =
CALCULATE (
COUNT ( 'JIRA_CICD'[Issue key] ),
'JIRA_CICD'[Status] = "Done",
'JIRA_CICD'[Resolved] <= MAX ( 'Calendar'[Date] ) -- Include only up to current month
)
RETURN
IF (
MAX ( 'Calendar'[Date] ) <= MaxResolvedDate, -- Show data only up to resolved dates
TargetValue - IssuesResolved, -- Subtract cumulative resolved issues from target
BLANK () -- Hide future months
)