/// <summary>
        /// 建立HealthChecks服务
        /// </summary>
        /// <param name="builder">HealthChecks服务创建者</param>
        /// <param name="configuration">应用程序配置</param>
        /// <returns></returns>
        protected virtual IHealthChecksBuilder BuildHealthChecks(IHealthChecksBuilder builder, IConfiguration configuration)
        {
            //system
            long providerMemory    = configuration["OSharp:HealthChecks:PrivateMemory"].CastTo(1000_000_000L);
            long virtualMemorySize = configuration["OSharp:HealthChecks:VirtualMemorySize"].CastTo(1000_000_000L);
            long workingSet        = configuration["OSharp:HealthChecks:WorkingSet"].CastTo(1000_000_000L);

            builder.AddPrivateMemoryHealthCheck(providerMemory);        //最大私有内存
            builder.AddVirtualMemorySizeHealthCheck(virtualMemorySize); //最大虚拟内存
            builder.AddWorkingSetHealthCheck(workingSet);               //最大工作内存

            OsharpOptions options = configuration.GetOsharpOptions();

            //数据库
            foreach (var pair in options.DbContexts.OrderBy(m => m.Value.DatabaseType))
            {
                string connectionString = pair.Value.ConnectionString;
                switch (pair.Value.DatabaseType)
                {
                case DatabaseType.SqlServer:
                    builder.AddSqlServer(connectionString, null, pair.Key);
                    break;

                case DatabaseType.Sqlite:
                    builder.AddSqlite(connectionString, name: pair.Key);
                    break;

                case DatabaseType.MySql:
                    builder.AddMySql(connectionString, pair.Key);
                    break;

                case DatabaseType.PostgreSql:
                    builder.AddNpgSql(connectionString, name: pair.Key);
                    break;

                case DatabaseType.Oracle:
                    builder.AddOracle(connectionString, name: pair.Key);
                    break;

                default:
                    throw new ArgumentOutOfRangeException($"OSharpOptions中 {pair.Value.DatabaseType} 不受支持");
                }
            }

            //SMTP
            if (options.MailSender != null)
            {
                var smtp = options.MailSender;
                builder.AddSmtpHealthCheck(smtpOptions =>
                {
                    smtpOptions.Host = smtp.Host;
                    smtpOptions.LoginWith(smtp.UserName, smtp.Password);
                });
            }

            //Redis
            if (options.Redis != null && options.Redis.Enabled)
            {
                var redis = options.Redis;
                builder.AddRedis(redis.Configuration);
            }

            //Hangfire
            if (configuration["OSharp:Hangfire:Enabled"].CastTo(false))
            {
                builder.AddHangfire(hangfireOptions =>
                {
                    hangfireOptions.MinimumAvailableServers = 1;
                });
            }

            return(builder);
        }