USGS L1 NRT
Completeness is calculated based on a comparison between the USGS M2M API and data downloaded into a S3 bucket. Metrics are calculated on a rolling 30 day basis. Data is updated every 15 minutes - and cached every 2 hours.
Sentinel 2 NRT
Calculated by querying ESA/Copernicus API for available Sentinel 2 datasets for the last 30 days, then compared with what is available in the ODC for the same time period. This ETL is run every 15 minutes.