Streams & Event Types

Events are classified into stream tiers that describe the nature and delivery pattern of the data. Consumers can subscribe by event type or by stream tier (e.g., “all timeseries”).

See Trackers & data coverage for a filterable matrix of which implemented providers deliver each event type.

Stream Types

Stream	Nature	Delivery Pattern
`session`	Bounded activity with start/end	One or more sessions per event
`snapshot`	Point-in-time measurement	One or more measurements per event
`timeseries`	High-frequency sampled data	Chunked into 15-minute windows
`aggregate`	Daily rollup	One summary per event
`profile`	Slow-changing user metadata	Sent on connect and on change

Event Types by Stream

Session

Event Type	Description
`activity`	Tracked workout or exercise session. Google Health can temporarily import this from steps/distance webhooks while exercise webhooks are unreliable.
`sleep`	Sleep period with stage breakdown

Snapshot

Event Type	Description
`body_measurement`	Weight, body composition, anthropometric data
`blood_pressure`	Blood pressure reading
`blood_glucose`	Blood glucose reading
`blood_work`	Lab results with variable analytes
`temperature`	Body temperature reading
`nutrition`	Food or calorie intake log entry
`hydration`	Water intake log entry

Timeseries

Event Type	Description
`heart_rate_series`	Continuous heart rate samples
`location_series`	GPS track data. Google Health can emit this when the temporary exercise fallback fetch resolves TCX GPS samples.
`spo2_series`	Oxygen saturation samples
`stress_series`	Stress level samples
`hrv_series`	Heart rate variability samples

Aggregate

Event Type	Description
`daily_summary`	Daily rollup of activity metrics

Profile

Event Type	Description
`user_profile`	Slow-changing user metadata