Fix excessive CPU utilization by BlobDepot monitoring code

[alexvru]

Changelog entry

Fix excessive CPU utilization by BlobDepot monitoring code

Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

Fixed O(N) CPU consumption on a periodic monitoring process.

[github-actions]

🟢 2025-03-24 12:41:00 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-03-24 12:42:38 UTC Pre-commit check linux-x86_64-release-asan for 7826f4f has started.
⚪ 2025-03-24 12:42:53 UTC Artifacts will be uploaded here
⚪ 2025-03-24 12:45:36 UTC ya make is running...
🟡 2025-03-24 13:54:28 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Details

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
12396	12312	0	37	11	36

⚪ 2025-03-24 13:55:31 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-03-24 14:17:13 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Details

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
135 (only retried tests)	95	0	4	2	34

⚪ 2025-03-24 14:17:23 UTC ya make is running... (failed tests rerun, try 3)
🟡 2025-03-24 14:33:54 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Test history | Ya make output | Test bloat | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
68 (only retried tests)	31	0	4	1	32

🟢 2025-03-24 14:34:06 UTC Build successful.
🟢 2025-03-24 14:34:37 UTC ydbd size 3.8 GiB changed* by +52.1 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 5fac434	merge: 7826f4f	diff	diff %
ydbd size	4 081 498 056 Bytes	4 081 551 424 Bytes	+52.1 KiB	+0.001%
ydbd stripped size	1 410 170 408 Bytes	1 410 182 952 Bytes	+12.2 KiB	+0.001%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-03-24 12:44:00 UTC Pre-commit check linux-x86_64-relwithdebinfo for 7826f4f has started.
⚪ 2025-03-24 12:44:15 UTC Artifacts will be uploaded here
⚪ 2025-03-24 12:47:04 UTC ya make is running...
🟡 2025-03-24 13:46:27 UTC Some tests failed, follow the links below. Going to retry failed tests...

Details

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
19906	18554	0	6	1232	114

⚪ 2025-03-24 13:48:07 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-03-24 13:58:27 UTC Tests successful.

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
170 (only retried tests)	66	0	0	0	104

🟢 2025-03-24 13:58:36 UTC Build successful.
🟢 2025-03-24 13:58:55 UTC ydbd size 2.2 GiB changed* by +33.2 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 5fac434	merge: 7826f4f	diff	diff %
ydbd size	2 319 968 416 Bytes	2 320 002 464 Bytes	+33.2 KiB	+0.001%
ydbd stripped size	484 989 600 Bytes	484 995 296 Bytes	+5.6 KiB	+0.001%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}