/// <summary>
/// This function is for the percentage at the top of the Overview bar. First, it updates the date range, datacenter, network,
/// and farm of the Reliability model object then calculates the Overview Bar percentage for all pipelines.
/// </summary>
/// <returns>JSON Object with all pipeline names and their percentage reliability</returns>
public string getOverviewHeader()
{
rel.ChangeDate(Convert.ToDateTime(Request.QueryString["start"]), Convert.ToDateTime(Request.QueryString["end"]));
rel.ChangeDataCenter(Request.QueryString["datacen"]);
rel.ChangeNetworkID(Convert.ToInt32(Request.QueryString["network"]));
rel.ChangeFarmID(Convert.ToInt32(Request.QueryString["farm"]));
return(JsonConvert.SerializeObject(rel.CalculateOverviewBar("Overview")));
}
