Docs at https://trinitycore.atlassian.net/wiki/display/tc/Monitoring+a+TrinityCore+server
* Common/Graphs: Initial proof of concept
* Move influx db code to its own class
* Reuse the same socket
* Allow to log values of different categories
* Allow to log events
* Pass the timestamp to influxdb
* Send events in batches
* Send data async
* Log server shutdown.
Fix memory leak.
* Allow to enable/disable Stats in the settings and at runtime
* Read interval between each batch send from config
* Add InfluxDB connection info to configs
* Move each event category to its own table
* Log pathfinding queries
* Move categories table initialization to constructor using enum as key to avoid assigning the table name to the wrong enum value
* Log player login/logout events.
Pass the hostname correctly in the HTTP request.
* Fix linux build
* Handle "Connection: close" HTTP header, reconnecting on next scheduled send.
Disable StatsLogger if connection fails, logging the error.
* Add an enum for categories of logged values, it's still possible to pass a string instead of the enum.
* Don't log the whole batchedData when InfluxDB returns an error, it's too long and unreadable on console.
* Allow to call a function at a specified interval in thread-safe World::Update() context to log data like player count.
* Log map tile load/unload
* Core/StatsLogger: Allow logging more value types other than ints
https://docs.influxdata.com/influxdb/v0.10/write_protocols/write_syntax/
* Fix a typo in string escape of StatsLogger
* Yet more fixes to the escaping in FormatInfluxDBValue
* DB/Gameobject: Fix respawn time of few Quest GameObjects
By Tauriella, closes#16701
* DB/Misc: Fix some engrish
By tkrokli closes#16648
* Tools/MMaps: Add format library linking to mmaps_generator
(Very) partial cherry pick of ed75b0649a
* Core/StatsLogger: Simplify code
Convert values and categories arrays to maps initialized in-place
Remove constructor and destructor
* Core/StatsLogger: Add realm name to the event and value tags
* Log amount of processed packet of each session
* Apply recent singleton changes to sStatsLogger too
* Fix influxdb data format if no realm name is present
* Remove unneeded newlines from request body, fixes response 400 from InfluxDB 0.10
* Rename Reporting folder to Metric
* Rename StatsLogger to Metric
* Rename InfluxDB configs to Metric
* Add Grafana dashboards
* Add a random annoying macro
* Move string formatting to Metric::SendBatch(), reducing performance footprint of Metric::LogEvent() and Metric::LogValue()
* Update grafana graphs refresing tags on load and showing now-15m data, refreshing every minute. These settings can be modified in grafana.
* Rename MetricData fields
* Contrib/Grafana: Rename dashboard files
* Contrib/Grafana: Replace hardcoded Windows/Ubuntu realm names by the default, Trinity
* Config/Worldserver: Add missing section to the index
* Contrib/Grafana: Add singlestat panels with current online players, update diff averages (1 min, 5 mins and 15 mins)
http://i.imgur.com/Zi8lfvS.png
* Core/Metric: Replace the enums MetricEventCategory and MetricValueCategory by strings
For the sake of simplicity and less recompile time when adding new metrics, similar to how TC_LOG_* works
* Contrib/Grafana: Display the current number of online players and not its average
Closes#15075
(cherry picked from commit 3ae1016082)
# Conflicts:
# src/server/game/Server/WorldSession.cpp
# src/server/game/World/World.cpp
# src/server/worldserver/Main.cpp
