Traffic Stats is a program written in Golang that is used to acquire and store statistics about CDNs controlled by Traffic Control. Traffic Stats mines metrics from Traffic Monitor’s JSON APIs and stores the data in InfluxDb. Data is typically stored in InfluxDb on a short-term basis (30 days or less). The data from InfluxDb is then used to drive graphs created by Grafana - which are linked to from Traffic Ops - as well as provide data exposed through the Traffic Ops API. Traffic Stats performs two functions: first it gathers stat data for Edge Caches and Delivery Services at a configurable interval (10 second default) from the Traffic Monitor API’s and stores the data in InfluxDb; second it summarizes all of the stats once a day (around midnight UTC) and creates a daily rollup containing the Max Gbps served and the Total Bytes served.
Stat data is stored in three different databases:
- cache_stats: The cache_stats database is used to store data gathered from edge caches. The measurements stored by cache are: bandwidth, maxKbps, and client_connections (ats.proxy.process.http.current_client_connections). Cache Data is stored with tags for hostname, cachegroup, and CDN. Data can be queried using tags.
- deliveryservice_stats: The deliveryservice_stats database is used to store data for delivery services. The measurements stored by delivery service are: kbps, status_4xx, status_5xx, tps_2xx, tps_3xx, tps_4xx, tps_5xx, and tps_total. Delivery Service stats are stored with tags for cachegroup, CDN, and Deliveryservice xml_id.
- daily_stats: The daily_stats database is used to store summary data for daily activities. The stats that are currently summarized are Max Bandwidth and Bytes Served and they are stored by CDN.
Traffic Stats does not influence overall CDN operation, but is required in order to display charts in Traffic Ops and Traffic Portal.