br: restore point summary shows incorrect information if use checkpoint and restore sst

[AkiraXie]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

restore point with checkpoint

2. What did you expect to see? (Required)

summary shows no error

3. What did you see instead (Required)

total-take is incorrent and speed is NaN

4. What is your TiDB version? (Required)

[2025/01/22 15:52:48.838 +00:00] [INFO] [collector.go:77] ["restore log success summary"] [total-take=8m14.160280359s] [source-start-point=455462248614985823] [source-end-point=455479045150998556] [target-end-point=455486652481273903] [source-start="2025-01-21 09:09:54.387 +0000"] [source-end="2025-01-22 02:57:48.087 +0000"] [target-end="2025-01-22 11:01:27.749 +0000"] [total-kv-count=12147041397] [skipped-kv-count-by-checkpoint=12136187042] [total-size=677.3GB] [skipped-size-by-checkpoint=675.7GB] ["average-speed (log)"=1.371GB/s] [restore-sst-kv-count=0] [restore-sst-kv-size=0] ["restore-sst-physical-size (after compression)"=0] [restore-sst-total-take=0s] ["average-speed (sst)"=NaNB/s]

before this restore, there is a former restore shows restore log duration is 4h+

[2025/01/22 10:57:38.548 +00:00] [INFO] [restore.go:543] ["set restore kv files concurrency"] [concurrency=1025]
[2025/01/22 10:57:38.548 +00:00] [INFO] [restore.go:546] ["set restore compacted sst files concurrency per store"] [concurrency=64]
[2025/01/22 10:57:38.548 +00:00] [WARN] [restore.go:1450] ["set max-index-length to max(3072*4) to skip check index length in DDL"]
[2025/01/22 10:57:38.548 +00:00] [WARN] [restore.go:1452] ["set index-limit to max(64*8) to skip check index count in DDL"]
[2025/01/22 10:57:38.548 +00:00] [WARN] [restore.go:1454] ["set table-column-count to max(4096) to skip check column count in DDL"]
...
[2025/01/22 15:03:00.642 +00:00] [INFO] [client.go:867] ["import files done"] [batch-count=8] [batch-size=6528] [take=252.212879ms] [files="[\"v1/20250122/01/1016/455478031427043341-ccb5f737-862a-4920-a0f6-75e3ed4ed395.log, \",\"v1/20250122/01/1016/455478080605257776-6dbc26d6-bf7f-4926-9728-6221538808b3.log, \",\"v1/20250122/02/1001/455478092008521747-b96c70da-ff8b-4af9-84c0-a074fd0c1a1b.log, \",\"v1/20250122/02/1016/455478118983401543-95de8c6b-b116-4eda-bc06-a82ef8b523bb.log, \",\"v1/20250122/02/1004/455478167152099341-a90461c6-dc00-47cb-8f0a-7e7da7c03c2e.log, \",\"v1/20250122/02/1001/455478196525334605-93c587b5-2b8a-458a-8006-1d5baf536c96.log, \",\"v1/20250122/02/1004/455478227366576138-af4e9528-3652-47ee-8963-14d03deb29f6.log, \",\"v1/20250122/02/1004/455478236947939425-ed992317-5252-4eb4-ac7e-7ba5b4593c72.log, \"]"]

8.5.0

[AkiraXie]

/component br
/severity moderate