Thanks for your replies -
The proposed method worked:
... | timechart span=1m sum(HTTP_5xx) | fillnull value=0 | rename _time AS Time | eval Time=strftime(Time, "%m-%d %H:%M")
However, using the above search command, the labels on the X-Axis disappear.
This is how chart labels looked before ("bad" timestamp formatting, but proper labels):
This is how chart labels look now (proper timestamp formatting, but labels not shown):
I use the following chart formatting option the force label visibility:
<param name="charting.primaryAxisLabels.majorLabelVisibility">show</param>
However, with the reformatted timestamps, the labels only partly appear (i.e. they are still cut off) when stretching the chart horizontally to ~ 2000 pixels...
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