Support left/right_elementwise for operators

[mwitkow]

When operating on vectors:
my_stuff_started - my_stuff_stopped, where both have a type label, the entries in my_stuff_started that don't have a matching my_stuff_stopped entry are removed from results. That's understandable, operators do a full join.

However, it should be possible to say that I want to retain stuff from my_stuff_started even if it is not present in my_stuff_stopped.

I understand that best practices are to prepopulate all your labels with default values, but sometimes it's impossible.

Are there any plans to implement left/right_elementwise

[brian-brazil]

This is covered by #393.

For that particular use case I'm not sure that's the best way to model it, missing time series are difficult to deal with at the best of times (http://prometheus.io/docs/practices/instrumentation/#avoid-missing-metrics). I'd suggest for determining the duration of batch jobs to export the duration as a separate gauge, see http://prometheus.io/client_java/io/prometheus/client/exporter/PushGateway.html for a Java example.

[lock]

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