Fix metrics in mam suite

[gustawlippa]

This should fix the tests using metrics. Because we allow any string to be a host type, and in testing its <<"test type">> one has to ensure that the metrics are checked against a sanitised host type prefix, because metrics cannot contain spaces in their names.

[codecov]

Codecov Report

Merging #3143 (1160df6) into master (6433bca) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3143      +/-   ##
==========================================
+ Coverage   79.47%   79.50%   +0.03%     
==========================================
  Files         396      396              
  Lines       32419    32419              
==========================================
+ Hits        25764    25774      +10     
+ Misses       6655     6645      -10     

Impacted Files	Coverage Δ
src/event_pusher/mod_event_pusher_sns.erl	83.56% <0.00%> (-5.48%)	⬇️
src/mam/mod_mam_rdbms_async_pool_writer.erl	61.81% <0.00%> (-3.64%)	⬇️
...c/global_distrib/mod_global_distrib_server_mgr.erl	76.83% <0.00%> (-0.57%)	⬇️
src/mod_muc_log.erl	77.72% <0.00%> (ø)
src/mod_muc_room.erl	77.06% <0.00%> (+0.17%)	⬆️
src/ejabberd_c2s.erl	89.28% <0.00%> (+0.29%)	⬆️
src/ejabberd_sm.erl	84.59% <0.00%> (+0.65%)	⬆️
src/global_distrib/mod_global_distrib_utils.erl	65.42% <0.00%> (+0.93%)	⬆️
src/muc_light/mod_muc_light_utils.erl	90.81% <0.00%> (+1.02%)	⬆️
src/mam/mod_mam_elasticsearch_arch.erl	88.39% <0.00%> (+1.78%)	⬆️
... and 2 more

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[chrzaszcz]

Great!