Hi RRD folks,
I know this is probably going to garner a 'nope, can't do that
response', but I was wondering if the RRD developers (Tobi et al) had
considered the capability of users adding comments to RRD files along
the lines of timestamp:comment string that could be added in the
header of an RRD archive. These comments could then be plotted on the
graphical output when RRDtool graph is called.
An example:
No comments (typical rrdtool graph output): http://eqinfo.ucsd.edu/
~rnewman/images/rrd_wishlist/nocomments.gif
With comments: http://eqinfo.ucsd.edu/~rnewman/images/rrd_wishlist/
comments.gif
I could see this capability being useful for viewers so they can read
the attribution of any anomalous changes in data values.
If I do an XML dump of an RRD archive, I see the following in the
(although not explicitly defined) 'header area':
<!-- Round Robin Database Dump --><rrd> <version> 0003 </version>
<step> 20 </step> <!-- Seconds -->
<lastupdate> 1181171131 </lastupdate> <!-- 2007-06-06
16:05:31 PDT -->
<ds>
<name> m0 </name>
<type> GAUGE </type>
<minimal_heartbeat> 21600 </minimal_heartbeat>
<min> NaN </min>
<max> NaN </max>
<!-- PDP Status -->
<last_ds> -2 </last_ds>
<value> -6.6000000000e+01 </value>
<unknown_sec> 0 </unknown_sec>
</ds>
<!-- Round Robin Archives -->
I could see altering this structure to be like (in the XML format of
rrdtool dump) :
<!-- Round Robin Database Dump --><rrd> <version> 0003 </version>
<step> 20 </step> <!-- Seconds -->
<lastupdate> 1181171131 </lastupdate> <!-- 2007-06-06
16:05:31 PDT -->
<ds>
<name> m0 </name>
<type> GAUGE </type>
<minimal_heartbeat> 21600 </minimal_heartbeat>
<min> NaN </min>
<max> NaN </max>
<!-- PDP Status -->
<last_ds> -2 </last_ds>
<value> -6.6000000000e+01 </value>
<unknown_sec> 0 </unknown_sec>
</ds>
<comments>
<!-- 2007-06-01 02:46:40 PDT / epochtime --> <row><v>New
instrument</v></row>
<!-- 2007-05-01 02:46:40 PDT / epochtime --> <row><v>Mass recenter</
v></row>
</comments>
<!-- Round Robin Archives -->
This could be added using a new command called 'rrdtool comment
archive_name.rrd timestamp comment_string'.
Comments? Thoughts? I would love to say that I will volunteer to make
these changes in the RRDTool source code, but it is way above my
capabilities, so I can meekly retreat back into my corner if someone
takes umbrage at my request. I wouldn't be asking for this capability
if RRD wasn't such as awesome tool - Tobi has already done an
exceptional job.
Thanks!
- Rob
________________________________________________________
Rob Newman Ph.D.
Institute of Geophysics and Planetary Physics
Scripps Institution of Oceanography
University of California, San Diego
9500 Gilman Drive, La Jolla, CA 92093-0225, USA
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