PluralKit/PluralKit.Core/Modules/MetricsModule.cs

using App.Metrics;

using Autofac;

namespace PluralKit.Core
{
    public class MetricsModule: Module
    {
        private readonly string _onlyContext;

        public MetricsModule(string onlyContext = null)
        {
            _onlyContext = onlyContext;
        }

        protected override void Load(ContainerBuilder builder)
        {
            builder.Register(c => InitMetrics(c.Resolve<CoreConfig>()))
                .AsSelf().As<IMetrics>().SingleInstance();
        }

        private IMetricsRoot InitMetrics(CoreConfig config)
        {
            var builder = AppMetrics.CreateDefaultBuilder();
            if (config.InfluxUrl != null && config.InfluxDb != null)
                builder.Report.ToInfluxDb(config.InfluxUrl, config.InfluxDb);
            if (_onlyContext != null)
                builder.Filter.ByIncludingOnlyContext(_onlyContext);
            return builder.Build();
        }
    }
}