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This ratio defaults to 1.0 (i.e. all metrics will be recorded), but we will set it much lower in sandbox and production, probably something closer to 0.01. This will reduce recorded metrics volume and thus StackDriver cost, while still retaining enough data for overall performance monitoring. This is handled stochastically, so as to not require any coordination between Java threads or GKE pods/clusters, as alternative approaches would (i.e. using a counter and recording every Nth, or throttling to a max metrics qps).