Recently saw this through https://discuss.systems/@pkhuong/114532017716618023 which summaries why this would be useful:

> Flagging old live (i.e., potentially immortal) allocations is easier (https://github.com/backtrace-labs/poireau) and more closely matches the goal of identifying why the heap grows instead of entering a steady state.

Ej. Why is Sidekiq memory consumption growing over time.