[NEW RBO] Use canonical statistic names

[alexpaniman]

Replace RecordsCount and DataSize with a more commonly used and clear ERows (estimated rows) and EBytes (estimated bytes). Also makes it clearer that we don't know the exact counts, only estimates.

[ydbot]

Run Extra Tests

Run additional tests for this PR. You can customize:

• Test Size: small, medium, large (default: all)
• Test Targets: any directory path (default: ydb/)
• Sanitizers: ASAN, MSAN, TSAN
• Coredumps: enable for debugging (default: off)
• Additional args: custom ya make arguments

[github-actions]

⚪ 2026-04-12 20:53:18 UTC Pre-commit check linux-x86_64-relwithdebinfo for 764b56c has started.
⚪ 2026-04-12 20:53:36 UTC Artifacts will be uploaded here
⚪ 2026-04-12 20:55:52 UTC ya make is running...
🟡 2026-04-12 23:13:13 UTC Some tests failed, follow the links below. Going to retry failed tests...

Details

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
49287	45741	0	1	3536	9

⚪ 2026-04-12 23:13:29 UTC ya make is running... (failed tests rerun, try 2)
🟢 2026-04-12 23:14:21 UTC Tests successful.

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
11 (only retried tests)	11	0	0	0	0

🟢 2026-04-12 23:14:24 UTC Build successful.
🟢 2026-04-12 23:14:41 UTC ydbd size 2.5 GiB changed* by 0 Bytes, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 75e04a0	merge: 764b56c	diff	diff %
ydbd size	2 662 222 888 Bytes	2 662 222 888 Bytes	0 Bytes	0.000%
ydbd stripped size	568 305 976 Bytes	568 305 976 Bytes	0 Bytes	0.000%

^{*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]

⚪ 2026-04-12 20:53:22 UTC Pre-commit check linux-x86_64-release-asan for 764b56c has started.
⚪ 2026-04-12 20:53:40 UTC Artifacts will be uploaded here
⚪ 2026-04-12 20:56:00 UTC ya make is running...
🟡 2026-04-12 22:40:01 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
18705	18650	0	20	31	4

🟢 2026-04-12 22:40:09 UTC Build successful.
🟢 2026-04-12 22:40:35 UTC ydbd size 4.1 GiB changed* by -96 Bytes, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 75e04a0	merge: 764b56c	diff	diff %
ydbd size	4 353 671 864 Bytes	4 353 671 768 Bytes	-96 Bytes	-0.000%
ydbd stripped size	1 635 563 856 Bytes	1 635 563 792 Bytes	-64 Bytes	-0.000%

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

[ydbot]

Backport

To backport this PR, click the button next to the target branch and then click "Run workflow" in the Run Actions UI.

Branch	Run
stable-25-4, stable-25-4-1, stable-26-1, stable-26-1-1
stable-26-1, stable-26-1-1
stable-26-1