3 commits

Author	SHA1	Message	Date
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
shikhman	f10a7d8fb0	Enforce monotonicity for IncrementableMetrics ... This change enforces that IncrementableMetrics should only monotonically increase in value, and adds a new increment() method to increment by one, which is slightly faster than incrementBy (due to a lack of non-negative checking) in the common case that the counter should only be incremented by one. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=130578421	2016-08-22 14:20:33 -04:00
shikhman	64abebec82	Add StackDriver implementation, in monitoring/metrics package ... ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=130287319	2016-08-15 17:12:35 -04:00