7 commits

Author	SHA1	Message	Date
shikhman	0e8d9e3859	Force endTimestamp to be strictly greater than or equal to startTimestamp ... This fixes an error that we've been seeing from Stackdriver. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=132358790	2016-09-07 12:09:23 -04:00
shikhman	dbb9ef80c5	Refactor ConcurrentHashMap creation code to a helper method ... ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=132352263	2016-09-07 12:06:26 -04:00
shikhman	93bf68039b	Add lock.unlock() to finally clause in Counter ... It is good practice to unlock a lock in a finally clause. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=132302413	2016-09-07 11:56:00 -04:00
shikhman	c11ac3129f	Factor out labelValue length check to abstract base class and small name fix ... ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=131902964	2016-09-02 13:47:21 -04:00
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