Avoid usage of metrics where a history is kept

[dominik-cnx]

Refer to

https://github.com/swisspost/mod-metrics/blob/develop/src/main/java/org/swisspush/metrics/MetricsModule.java#L86-L106

The purpose of this PR is to find out we use a Gauge instead of a Histogram for "duration" metrics and also for some queue counter in order to reduce the memory foot print. The impact will be that we only have a simple counter here

compared to

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 48.44%. Comparing base (5256fe4) to head (45f39c1).
Report is 17 commits behind head on develop.

Files with missing lines	Patch %	Lines
...isspush/gateleen/monitoring/MonitoringHandler.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #609      +/-   ##
=============================================
- Coverage      48.79%   48.44%   -0.36%     
+ Complexity      1877     1862      -15     
=============================================
  Files            238      238              
  Lines          11953    11953              
  Branches        1261     1261              
=============================================
- Hits            5833     5791      -42     
- Misses          5616     5659      +43     
+ Partials         504      503       -1     

Flag	Coverage Δ
	48.44% <0.00%> (?)

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