This procedure is defined in the server but not documented via ad_proc or proc_doc and may be intended as a private interface.
The procedure is defined as:
proc ::nsmcp::summaryOverflowSample {sampleVar capacity priority offset fields} {
upvar 1 $sampleVar sample
set entries [dict get $sample entries]
if {[llength $entries] >= $capacity && $priority >= [dict get $sample maximum]} {return}
lappend entries [list $priority $offset $fields]
set entries [lrange [lsort -integer -index 0 $entries] 0 [expr {$capacity-1}]]
dict set sample entries $entries
dict set sample maximum [lindex $entries end 0]
}