Stream provisioning metric changes#1014
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dhananjay-sawner wants to merge 7 commits into
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May 9, 2026 14:39
Captures the duration between datastream creation (system.creation.ms) and the INITIALIZING -> READY transition in handleDatastreamAddOrDelete. Aggregate-only sliding-window histogram (15 min) on the Coordinator module, registered via BrooklinHistogramInfo in CoordinatorMetrics so the metrics bridge surfaces it (per #945 precedent). Resume from STOPPED bypasses this code path (DatastreamResources.resume sets READY directly), so the metric only fires on initial creation.
Adds an INFO log line in recordTimeToReadyMs alongside the histogram update so per-stream provisioning times are recoverable from logs. The histogram aggregates across the sliding window and cannot expose individual sample values; the log line preserves per-datastream attribution for retrospective analysis.
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Summary
timeToReadyMshistogram (Coordinator): records the duration between datastream creation (system.creation.ms) and theINITIALIZING -> READYtransition. Uses a 15-minute sliding windowreservoir; exposed via the standard
BrooklinHistogramInfoattributes (Count, Max, Mean, p50/p75/p95/p99, etc.). Enables alerting on long provisioning viaMax.slowProvisioningCountcounter (Coordinator): incremented whenever a datastream's time-to-ready exceeds a configurable threshold.brooklin.server.coordinator.slowProvisioningThresholdMs: controls the threshold above which a provisioning is counted as slow. Default 10 minutes. Threshold lives in config, so brooklin-server can tune per fabric without a library bump.Testing Done
testTimeToReadyHistogramOnCreate— histogram count increases and sample is non-negative afterINITIALIZING -> READYtestTimeToReadyHistogramNotEmittedOnResume— histogram count does not change onSTOPPED -> READYresumetestSlowProvisioningCounterIncrementsWhenAboveThreshold— with threshold = 0 ms, counter increments after stream goes READYtestSlowProvisioningCounterDoesNotIncrementWhenBelowThreshold— with threshold = 1 h, counter stays unchanged after stream goes READYmint build