beautiful ASCII visualization! In theory class we called it "interval arithmetic"
https://en.wikipedia.org/wiki/Interval_arithmetic (2+2)-free posets, ascent sequences and pattern avoiding permutations https://arxiv.org/abs/0806.0666
https://en.wikipedia.org/wiki/Interval_arithmetic (2+2)-free posets, ascent sequences and pattern avoiding permutations https://arxiv.org/abs/0806.0666
The coloring depending on response time happens in intervals, that much I can say.
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#4 |----| |------| |--|
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Sorry about that.
Assuming I am looking at your sketch with the x-axis being time, I just want to note that specific to this library there won't be two events (request start, end or log) at the same time. (The "concurrency" here comes from coroutines, not parallel threads)
#1 |------|
#2 |--------|
#1 |-------|
#2 |---------|
#1 |-------------|
#2 |------------|
#1 |---------------------|
#2 |----------|