Last status by date - powerbi

Question

I have the following table of task runs with timestamp and status:
Timestamp
Task
Status
2022-08-19 12:34:11
1
success
2022-08-20 18:14:33
2
failure
2022-08-21 09:03:10
1
failure
2022-08-22 22:12:02
3
failure
2022-08-23 03:52:09
2
success
2022-08-24 15:38:42
3
success
I'm looking for the latest status by timestamp for each task plus the total number of tasks that are currently in "success" status.
The expected outcome is
Task
Status
1
failure
2
success
3
success
so 2 tasks are currently in status "success".

Answer 1

Let's first create the table:
Now This is the code:
Result =
ADDCOLUMNS (
VALUES ( YourTbl[Task] ),
"MaxDate", CALCULATE ( VALUES ( YourTbl[Status] ), LASTDATE ( YourTbl[Timestamp] ) ),
"SuccessCount", CALCULATE ( COUNTROWS ( YourTbl ), YourTbl[Status] = "success" )
)
The result It produces :

Answer 2

The time intelligence function LASTDATE() returns a table (albeit with only one value) and can be directly used as a filter in CALCULATE():
Last Status =
CALCULATE (
VALUES ( Tasks[Status] ),
LASTDATE ( Tasks[Timestamp] )
)
If this measure is filtered by Task (e.g. in a table) it returns the status from the last timestamp:
Counting the successful tasks is a bit trickier, since the above measure can't be filtered directly, but an intermediate table is needed:
Count Success =
VAR tbl =
ADDCOLUMNS (
VALUES ( Tasks[Task] ),
"Status", [Last Status]
)
RETURN
COUNTROWS(
FILTER(
tbl,
[Status] = "success"
)
)