Core/Metric: Add more metrics about World::Update() loop (#25098)

* Core/Metric: Add more metrics about World::Update() loop

* Add new Performance profiling grafana dashboard

* Add new cmake setting WITHOUT_METRICS that disables all metrics

As new metrics are added, someone might want to disable them if unused.

* Add more metrics about World::Update() loop

* Remove old performance profiling features

Remove "server set difftime" command, "-RecordUpdateTimeDiffInterval" and "MinRecordUpdateTimeDiff" worldserver config settings and their related code.
The whole UpdateTime class could be removed too.

* Update and rename 2020_07_99_99_world.sql to 2020_07_24_00_world.sql

cmake/options.cmake

@@ -49,6 +49,7 @@ endif()
 option(WITH_WARNINGS    "Show all warnings during compile"                            0)
 option(WITH_COREDEBUG   "Include additional debug-code in core"                       0)
 option(WITH_STRICT_DATABASE_TYPE_CHECKS "Enable strict checking of database field value accessors" 0)
+option(WITHOUT_METRICS  "Disable metrics reporting (i.e. InfluxDB and Grafana)"       0)
 option(COPY_CONF        "Copy authserver and worldserver .conf.dist files to the project dir"      1)
 set(WITH_SOURCE_TREE    "hierarchical" CACHE STRING "Build the source tree for IDE's.")
 set_property(CACHE WITH_SOURCE_TREE PROPERTY STRINGS no flat hierarchical hierarchical-folders)

cmake/showoptions.cmake

@@ -123,6 +123,13 @@ if(PERFORMANCE_PROFILING)
   add_definitions(-DPERFORMANCE_PROFILING)
 endif()
 
+if(WITHOUT_METRICS)
+  message("")
+  message(" *** WITHOUT_METRICS - WARNING!")
+  message(" *** Please note that this will disable all metrics output (i.e. InfluxDB and Grafana)")
+  add_definitions(-DWITHOUT_METRICS)
+endif()
+
 if(WITH_STRICT_DATABASE_TYPE_CHECKS)
   message("")
   message(" *** WITH_STRICT_DATABASE_TYPE_CHECKS - WARNING!")