Commits on Apr 13, 2021

1. Skip ConstLabels and namespace prefixes for "up" & internal metrics …

   Internal metrics consumed by Prometheus such as "up" indicate
   a status of the target, as either "up" with 1.0 or "down" with 0.0.
   This change ensures that no ConstLabels, nor namespace prefixes will
   be added to such metrics. This ensures that when one exports with
   the special name "up", that it passes through up to the Prometheus
   exporter, so:
   
       # HELP up up
       # TYPE up counter
       up{instance="localhost:9999"} 1
   
   instead of:
   
       # HELP tests_up tests/up
       # TYPE tests_up counter
       tests_up{instance="localhost:9999",service="spanner"} 1
   
   A further assertion can be added to ensure that "up" is a gauge,
   but I am not sure that it might be necessary, just in case some
   user wants to expose it as a counter.
   
   Updates open-telemetry/wg-prometheus#8

   

   odeke-em committed Apr 13, 2021
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