sync_to_1.1: defer on time.since not work

[gouhongshen]

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue #13983

What this PR does / why we need it:

fix the time.Since not deferred

[matrix-meow]

@gouhongshen Thanks for your contributions!

Title: sync_to_1.1: defer on time.since not work

Body: This pull request fixes the issue #13983. The problem is that the time.Since function is not being deferred properly. This PR adds a defer statement to ensure that the v2.TaskStorageUsageReqDurationHistogram is observed correctly.

Changes:

• In handle.go, on line 1272, a defer statement is added to observe the duration of the task storage usage request.

Review:

Overall, the changes made in this pull request seem to address the issue correctly. The addition of the defer statement ensures that the v2.TaskStorageUsageReqDurationHistogram is observed properly. However, there are a few suggestions to optimize the changes:

1. Naming: The variable start could be renamed to something more descriptive, such as requestStartTime, to improve code readability.

2. Error Handling: It would be beneficial to handle any potential errors that may occur when observing the duration. This can be done by adding a recover statement within the defer function to catch and log any panics.

3. Documentation: It would be helpful to add a comment explaining the purpose of the defer statement and its relationship to the time.Since function.

Security Concerns: There don't appear to be any security concerns in this pull request.

Overall, the changes made in this pull request are appropriate and address the issue effectively. The suggestions provided aim to improve code readability, error handling, and documentation.