This max depth is used to avoid deep recursion in the span tree,
which can lead to stack overflows and performance issues.
Spans deeper than this depth will be re-parented to an ancestor
at the cut-off depth (Flattening).
A single memory usage sample: (timestamp, memory_bytes, memory_pressure).
Sorted by timestamp. memory_pressure is an OS-reported pressure value in
the range 0..=100; 0 is used when the reporter platform did not expose
a pressure signal.