Man pages matching name lttng-ust-dl in section 3:

lttng-ust-dl.3.en	debian 10 / liblttng-ust-dev
lttng-ust-dl.3.en	debian 11 / liblttng-ust-dev
lttng-ust-dl.3.en	debian 12 / liblttng-ust-dev