MustTagKey creates a new `tag.Key` from a string, panic if the key is not a valid.

NewController returns a new metrics controller.

RecordWithTags records a metric value and tags.

RegisterPrometheusExporter register a prometheus exporter to OpenCensus with a given prometheus metric registry.

RegisterStackdriverExporter register a Stackdriver exporter to OpenCensus.

SetReportingPeriod set appropriate reporting period which depends on exporters we are going to use.

SetupMetrics initializes metrics reporting with the provided configuration.

GameServersStateCount is the size of LRU cache and should contain all gameservers state changes Upper bound could be estimated as 10_000 of gameservers in total each moment, 10 state changes per each gameserver and about 10 minutes for a game session, and 6 gameservers per hour.

MetricResyncPeriod is the interval to re-synchronize metrics based on indexed cache.

Config holds configuration for metrics reporting.

Controller is a metrics controller collecting Agones state metrics nolint:govet // ignore fieldalignment, singleton.

GameServerCount is the count of gameserver per current state and per fleet name.