title: What do the summary index 'psrsvd' fields stand for?
body: <p>Summary indexing in Splunk produces a lot of psrsvd_* fields.  What do they stand for?  I presume they're acronyms or abbreviations.  Here are some examples when averaging the number of bytes returned per client IP, as logged by apache (ie <code>sistats avg(bytes) by clientip</code>):</p>
  
  <ul>
  <li>psrsvd_ct_bytes</li>
  <li>psrsvd_gc</li>
  <li>psrsvd_nc_bytes</li>
  <li>psrsvd_sm_bytes</li>
  <li>psrsvd_ss_bytes</li>
  <li>psrsvd_v</li>
  <li>psrsvd_vt_bytes</li>
  </ul>