fix(metricstream): set recommended filter by omission #151
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Previously we were collecting all metrics by omission. This commit instead loads a recommended set of filters from a file on disk. The file is kept in sync with the filter we provide for cloudformation.
We could have loaded the filter dynamically directly from the hosted URL, but that would be at odds with the idempotent nature of terraform modules. Since we already have to update the binary versions of lambda functions, we can piggyback on that process to mirror the file.