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Make CostTracker aware of inflight transactions (#437)
When a leader is packing a Bank, transactions costs are added to the CostTracker and then later updated or removed, depending on if the tx is committed. However, it is possible for a Bank to be frozen while there are several tx's in flight. CostUpdateService submits a metric with cost information almost immediately after a Bank has been frozen. The result is that we have observed cost details being submitted before some cost removals take place, which causes a massive over-reporting of the block cost compared to actual. This PR adds a field to track the number of transactions that are inflight, and adds a simple mechanism to try to allow that value to settle to zero before submitting the datapoint. The number of inflight tx's is submitted with the datapoint, so even if the value does not settle to zero, we can still detect this case and know the metric is tainted. Co-authored-by: Andrew Fitzgerald <[email protected]>
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