shikhman 91f8b6da38 Change to metrics to keep track of when the metric value was first set ... This CL also adds IncrementableMetric#reset() methods to allow resetting the value and start timestamp of IncrementableMetrics. This is necessary because some backends, like Stackdriver, use non-monotonic changes in cumulative metric values to detect timeseries restarts. Tracking and re-setting the start timestamp allows users to track mostly monotonic metrics which may have non-monotonic discontinuities. See https://cloud.google.com/monitoring/api/ref_v3/rest/v3/TimeSeries#Point for more details. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=130795229		2016-08-22 14:44:28 -04:00
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com/google	Fix up license headers and Python linting	2016-08-02 19:16:42 -04:00
google/registry	Change to metrics to keep track of when the metric value was first set	2016-08-22 14:44:28 -04:00