fix: restore sink ping

[Yisaer]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 70.75%. Comparing base (c87824a) to head (6fdecc9).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
extensions/impl/sql/sink.go	50.00%	4 Missing and 2 partials ⚠️
internal/server/meta_init.go	42.86%	3 Missing and 1 partial ⚠️
internal/topo/node/node.go	55.56%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3220      +/-   ##
==========================================
+ Coverage   70.72%   70.75%   +0.03%     
==========================================
  Files         396      396              
  Lines       44239    44267      +28     
==========================================
+ Hits        31287    31321      +34     
+ Misses      10456    10449       -7     
- Partials     2496     2497       +1     

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