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# frozen_string_literal: true
module Gitlab
module Metrics
module Samplers
class DatabaseSampler < BaseSampler
DEFAULT_SAMPLING_INTERVAL_SECONDS = 5
METRIC_PREFIX = 'gitlab_database_connection_pool_'
METRIC_DESCRIPTIONS = {
size: 'Total connection pool capacity',
connections: 'Current connections in the pool',
busy: 'Connections in use where the owner is still alive',
dead: 'Connections in use where the owner is not alive',
idle: 'Connections not in use',
waiting: 'Threads currently waiting on this queue'
}.freeze
def metrics
@metrics ||= init_metrics
end
def sample
host_stats.each do |host_stat|
METRIC_DESCRIPTIONS.each_key do |metric|
metrics[metric].set(host_stat[:labels], host_stat[:stats][metric])
end
end
end
private
def init_metrics
METRIC_DESCRIPTIONS.to_h do |name, description|
[name, ::Gitlab::Metrics.gauge(:"#{METRIC_PREFIX}#{name}", description)]
end
end
def host_stats
return [] unless ActiveRecord::Base.connected?
[{ labels: labels_for_class(ActiveRecord::Base), stats: ActiveRecord::Base.connection_pool.stat }]
end
def labels_for_class(klass)
{
host: klass.connection_db_config.host,
port: klass.connection_db_config.configuration_hash[:port],
class: klass.to_s
}
end
end
end
end
end
Gitlab::Metrics::Samplers::DatabaseSampler.prepend_mod_with('Gitlab::Metrics::Samplers::DatabaseSampler')
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