Running zhstat-chart -s /opt/zimbra/zmstat -d /tmp/zmstats (or whatever)
generates output where "summary.txt", which is displayed as part of
index.html, has no data values. It looks like this...
# Perf Stats #
Mail Server CPU Sys :
Mail Server CPU User :
Mail Server CPU Idle :
Mail Server CPU Iowait :
Full GC% :
Young GC% :
Mailbox add rate :
Mailbox add latency :
Mailbox get latency :
Soap response time:
Pop response time:
Imap response time:

Also, I'll note that the "Swap Activity Host xxx Disk Utilization (Top 10 avg) "
graph contains "no data available", which may be a separate issue, but
I thought I'd mention it.

I've seen this on ubuntu 32bit NE during many of the 6.0.x versions.
Presently: Release 6.0.8_GA_2661.UBUNTU8 UBUNTU8 NETWORK edition.

So I think the tool is broken for ubuntu or I'm missing some utility. Can anyone
reproduce this, or suggest a debugging method?