| .. |
| .. Copyright 2015 Comcast Cable Communications Management, LLC |
| .. |
| .. Licensed under the Apache License, Version 2.0 (the "License"); |
| .. you may not use this file except in compliance with the License. |
| .. You may obtain a copy of the License at |
| .. |
| .. http://www.apache.org/licenses/LICENSE-2.0 |
| .. |
| .. Unless required by applicable law or agreed to in writing, software |
| .. distributed under the License is distributed on an "AS IS" BASIS, |
| .. WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| .. See the License for the specific language governing permissions and |
| .. limitations under the License. |
| .. |
| |
| .. _reference-label-tc-ts: |
| .. |arrow| image:: fwda.png |
| |
| |
| Traffic Stats |
| ============= |
| Traffic Stats is a program written in `Go <http.golang.org>`_ 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 <http://influxdb.com>`_. Data is typically stored in InfluxDb on a short-term basis (30 days or less) and is used to drive graphs created by `Grafana <http://grafana.org>`_ which are linked from Traffic Ops. 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 <https://influxdb.com/docs/v0.9/concepts/glossary.html#measurement>`_ stored by cache are: bandwidth, maxKbps, and client_connections (ats.proxy.process.http.current_client_connections). Cache Data is stored with `tags <https://influxdb.com/docs/v0.9/concepts/glossary.html#tag>`_ 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 Operations. |
