If you have selected to store billing messages to the database,
      it is also possible to generate and display a set of histograms
      from the data in these tables.  To turn on plot generation, set
      the property httpd.enable.plots.billing to
      true and restart the domain in which the
      httpd is running.
    
Example:
Extract from the layout file:
[httpdDomain]
     billing.enable.db=true
     httpd.enable.plots.billing=true
[httpdDomain/httpd]
[httpdDomain/billing]
...
The the frequency of plot refreshing and the type of plot produced can be controlled by:
- billingPlotsTimeoutInMins(defaults to- 30)
- httpd.plots.billing.type(defaults to- pngand can be set to- gif)
The plots provide aggregate views of the data for 24-hour, 7-day, 30-day and 365-day periods.
The plot types are:
- (Giga)bytes read and written for both dCache and HSM backend (if any) 
- Number of transactions/transfers for both dCache and HSM backend (if any) 
- Maximum, minimum and average connection time 
- Cache hits and misses - Note- The data for this last histogram is not automatically sent, since it contributes significantly to message traffic between the pool manager and the billing service. To store this data (and thus generate the relevant plots), the - poolmanager.enable.cache-hit-messageproperty must be set either in- dcache.confor in the layout file for the domain where the- poolmanagerruns:- poolmanager.enable.cache-hit-message=true 
Each individual plot can be magnified by clicking on it.
 
   