Fix concurrent access #2

[miklezzzz]

Some other race conditions to fix have been detected.

Overview

What this PR does / why we need it

Special notes for your reviewer

[juev]

Why not use sync.Map victoriaMetrics blog?

[miklezzzz]

to play safe, I suppose.
At first, I felt agitated to use something different like sync.Map, but there are two factors against it there:

• to stay aligned with the rest of the code;
• I don't feel the BindingMonitorLinks map experience heavy concurrency load, that would outweigh using a simpler solution.