Check and log status of the APM server connection

[felixbarny]

No description provided.

[codecov-io]

Codecov Report

Merging #113 into master will increase coverage by 0.12%.
The diff coverage is 90%.

@@             Coverage Diff              @@
##             master     #113      +/-   ##
============================================
+ Coverage     77.19%   77.31%   +0.12%     
  Complexity      928      928              
============================================
  Files            96       96              
  Lines          3139     3169      +30     
  Branches        275      280       +5     
============================================
+ Hits           2423     2450      +27     
- Misses          570      571       +1     
- Partials        146      148       +2

Impacted Files	Coverage Δ	Complexity Δ
...elastic/apm/report/ApmServerHttpPayloadSender.java	75.3% <90%> (+8.64%)	7 <0> (ø)	⬇️

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