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* Merge instrument cache to inserter The current pipeline resolution path will only add the resolved aggregators to the pipeline when it creates one (cache miss). It will not add it if there is a cache hit. This means (since we cache instruments at the meter level, not the pipeline level) the first reader in a multiple-reader setup is the only one that will collect data for that aggregator. All other readers will have a cache hit and nothing is added to the pipeline. This is causing #3720. This resolves #3720 by moving the instrument caching into the inserter. This means aggregators are cached at the reader level, not the meter. * Rename aggCV to aggVal --------- Co-authored-by: Chester Cheung <cheung.zhy.csu@gmail.com>