[exporter/loadbalancer] Add a new routing key: streamID
#34086
Merged
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Description: This adds a new routing option for metrics: streamID. This routes datapoints based on their streamID. That's the unique hash of all it's attributes, plus the attributes and identifying information of its resource, scope, and metric data
Link to tracking Issue: #32513
Testing: I added to the existing testing suites, testing the new routing, as well as adding to the benchmark suite
Documentation: I updated the README to describe the new routingKey:
metricID
, and how it works