test(agent): Document jitter drift behavior across ticker types #18282
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Add tests covering the current jitter behavior for all three ticker types over 60 collection cycles (simulating ~1 hour of operation): - RollingTicker: ~5 minute drift (avg interval ~65s vs 60s) due to each tick being interval + random(0, jitter) - AlignedTicker: minimal drift (~3s) as it realigns to interval boundaries, allowing jitter variations to average out - UnalignedTicker: minimal drift (~1s) since it uses a fixed internal ticker and applies jitter only as post-tick delay These tests document the behavior described in issue influxdata#17287, where collection_jitter increases the effective collection interval for RollingTicker. They serve as a baseline for validating future changes to jitter handling. Related: influxdata#17287
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Summary
Add tests covering the current jitter behavior for all three ticker types over 60 collection cycles (simulating ~1 hour of operation):
RollingTicker: ~5 minute drift (avg interval ~65s vs 60s) due to each tick being interval + random(0, jitter)
AlignedTicker: minimal drift (~3s) as it realigns to interval boundaries, allowing jitter variations to average out
UnalignedTicker: minimal drift (~1s) since it uses a fixed internal ticker and applies jitter only as post-tick delay
These tests document the behavior described in issue #17287, where collection_jitter increases the effective collection interval for RollingTicker. They serve as a baseline for validating future changes to jitter handling.
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Related issues
related to #17287