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Trends
Where Statistics answers "how many now", Trends answers "how has that moved". Every page here is a long-run series with the same filtering, zoom and legend behaviour.
What a point on the line means
Each series is bucketed by UTC day, and each page defines its cohort slightly differently. This is the detail that decides whether a comparison is valid:
| Page | A point on day D counts… |
|---|---|
| Archive | the fleet as captured in day D's archive snapshot |
| Connections | connection events whose timestamp fell on day D |
| Uptimes | uptime change-points whose timestamp fell on day D |
| Measurements | measurements that started on day D |
| Probe health | the hourly health snapshots rolled up to day D |
The measurement series is the one that catches people out: it is keyed on start date, so it counts new measurements, not running ones. A flat line means no new measurements were created, not that nothing is running.
The pages
Archive (/graphs/probes-archive) · public — fleet size and composition over time, from the daily probe archive. The longest-running series on the site.
Connections (/graphs/events-connections) · public — connection-event volume over time. Useful for spotting fleet-wide disruption: a spike here is usually infrastructure, not one network.
Uptimes (/graphs/events-uptimes) · public — uptime change-points: firmware updates, renumbering, reboots and clock resyncs. Because it is change-compressed, a quiet period genuinely means nothing happened rather than nothing being recorded.
Measurements (/graphs/measurements-meta) · public — measurement metadata trends, keyed on start date as above.
Probe health (/graphs/probes-health) · staff — health trends from the hourly snapshots.
Reading a break in a series
A gap is not the same as a drop, and neither is necessarily about the internet. Before drawing a conclusion, check Data delay — a series that stops short of today is usually telling you about the ingestion cadence, and a hole in the middle is usually a missed window that a backfill can still fill in.
See also Gaps versus zeroes.
Background reading: Reading the charts · Data delay and freshness