Hi Brad,
On Thursday 08 November 2007 02:25:21 Brad Nicholes wrote:
> [...] Briefly I have been trying to add some additional data to the
> gmond XDR packets so that we can communicate attributes such as an
> alternate TITLE for the metric or which GROUP(s) the metric belongs to (or
> anything else that we dream up in the future). What I have done to solve
> this issue is the following [...]
>From a quick skim, this all looks pretty good.
Although it's early days, are you planning on supporting "metric packing" (for
want of a better name) with several metrics will end up in a single UDP
packet?
So, if I've understood correctly, the potential attributes are now:
1. name: unique(*) short string for metric (potential use: create a
suitable filename for RRD storage)
2. host: the FQDN of the host from which the metric proports to come.
3. type: what kind of data is collected.
4. value: a (current/recent) measured value of this metric
5. title: short name (potential use: a title of an RRD graph)
6. description: a longer string, giving more information (potential use:
pop-up box in web-interface)
7. group: some indication of how this metric can be grouped with others.
8. units: a suffix to each number (potential use: label in y-axis, suffix
after static values)
9. slope: an indication of whether the data is a counter-, gauge- or
static- metric.
10. tmax: indicate how regularly the metric should be updated.
11. dmax: how quickly a metric should be dropped when no further
measurements are received.
(*) The (name,host) ordered pairs must be unique for any one metric.
Data packet contains 1.--4.
Metadata packet contains 1.--3. and 5.--11.
Do we also want to have a timestamp when the metric was measured, or do we
assume it was sufficiently close to "now"?
If we're going to record metrics in base-units (bytes rather than megabytes)
and let RRDTool do the scaling, then we should also include a flag about
whether the SI scaling prefix should be in powers of 10 (kilo, Mega, ...) or
powers of 2 (kibi, Mebi, ...). IIRC, RRDTool supports both.
Perhaps we could add a bit-wise set of attributes one bit could be wither the
metric should be scaled by powers-of-10 or powers-of-2. The current slope
value could be folded in with this attribute, or left separate.
Did we come to any conclusion about the semantics of the group field?
Something like a space separated list of groups. Would membership of a group
imply plotting together on the same graph, or somehow close together on a
webpage?
Sorry, too many questions!
Cheers,
Paul.
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