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profiles: improve stack tree description #1

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aalexand merged 1 commit into from
May 12, 2025
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profiles: improve stack tree description #1

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44 changes: 35 additions & 9 deletions opentelemetry/proto/profiles/v1development/profiles.proto
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Original file line number Diff line number Diff line change
Expand Up @@ -138,20 +138,46 @@ message ProfilesData {
// corresponding to the given stack tree node. The two arrays must have the
// same length. The parent array uses -1 for the root nodes.
//
// For example, the following location and stack tree data:
// For example, the following locations and stack tree data:
//
// location_table = ["", "main", "foo", "bar", "baz1", "baz2"]
// (stack index) = 0 1 2 3 4 5
// stack_parent_array = [-1, 0, 1, 2, 2, 1]
// stack_location_index = [ 1, 2, 3, 4, 5, 5]
// +-------------+----------------+--------------------+----------------------+
// | stack index | location_table | stack_parent_array | stack_location_index |
// +-------------+----------------+--------------------+----------------------+
// | 0 | "" | -1 | 1 |
// | 1 | "main" | 0 | 2 |
// | 2 | "foo" | 1 | 3 |
// | 3 | "bar" | 2 | 4 |
// | 4 | "baz1" | 2 | 5 |
// | 5 | "baz2" | 1 | 5 |
// +-------------+----------------+--------------------+----------------------+
//
// are encoding these stacks (the number is the stack index):
//
// main|0 -> foo|1 -> bar|2
// main|0 -> foo|1 -> bar|2 -> baz1|3
// main|0 -> foo|1 -> bar|2 -> baz2|4
// main|0 -> foo|1 -> baz2|5
// main (0)
// └── foo (1)
// ├── bar (2)
// │ ├── baz1 (3)
// │ └── baz2 (4)
// └── baz2 (5)
//
// And here is an example of the operations to decode the stack trace
// "main->foo->bar->baz2" at stack index 4.
//
// 1. Lookup stack_location_index[4] = 5
// 2. Lookup location_table[5] = "baz2"
// 3. Lookup stack_parent_array[4] = 2
//
// 4. Lookup stack_location_index[2] = 3
// 5. Lookup location_table[3] = "bar"
// 6. Lookup stack_parent_array[2] = 1
//
// 7. Lookup stack_location_index[1] = 2
// 8. Lookup location_table[2] = "foo"
// 9. Lookup stack_parent_array[1] = 0
//
// 10. Lookup stack_location_index[0] = 1
// 11. Lookup location_table[1] = "main"
// 12. Lookup stack_parent_array[0] = -1
repeated int32 stack_parent_array = 9;
repeated int32 stack_location_index = 10;
}
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