angular-cli/docs/design/analytics.md

Usage Metrics Gathering

This document list exactly what is gathered and how.

Any change to analytics should most probably include a change to this document.

Pageview

Each command creates a pageview with the path /command/${commandName}/${subcommandName}. IE. ng generate component my-component --dryRun would create a page view with the path /command/generate/@schematics_angular/component.

We use page views to keep track of sessions more effectively, and to tag events to a page.

Project names and target names will be removed. The command ng run some-project:lint:some-configuration will create a page view with the path /command/run.

Dimensions

Google Analytics Custom Dimensions are used to track system values and flag values. These dimensions are aggregated automatically on the backend.

One dimension per flag, and although technically there can be an overlap between 2 commands, for simplicity it should remain unique across all CLI commands. The dimension is the value of the x-user-analytics field in the schema.json files.

To create a new dimension (tracking a new flag):

1. Create the dimension on analytics.google.com first. Dimensions are not tracked if they aren't defined on GA.
2. Use the ID of the dimension as the x-user-analytics value in the schema.json file.
3. Add a new row to the table below in the same PR as the one adding the dimension to the code.
4. New dimensions PRs need to be approved by stephenfluin@google.com and iminar@google.com. This is not negotiable.

DO NOT ADD x-user-analytics FOR VALUES THAT ARE USER IDENTIFIABLE (PII), FOR EXAMPLE A PROJECT NAME TO BUILD OR A MODULE NAME.

Note: There's a limit of 20 custom dimensions.

List Of All Dimensions

Id	Flag	Type
1	CPU Count	number
2	CPU Speed	number
3	RAM (In GB)	number
4	Node Version	number
5	Flag: --style	string
6	--collection	string
7	Flag: --strict	boolean
8	Angular CLI Major Version	string
9	Flag: --inline-style	boolean
10	Flag: --inline-template	boolean
11	Flag: --view-encapsulation	string
12	Flag: --skip-tests	boolean
13	Flag: --aot	boolean
14	Flag: --minimal	boolean
16	Flag: --optimization	boolean
17	Flag: --routing	boolean
18	Flag: --skip-import	boolean
19	Flag: --export	boolean
20	Build Errors (comma separated)	string

Metrics

List of All Metrics

Id	Flag	Type
1	NgComponentCount	number
2	UNUSED_2	none
3	UNUSED_3	none
4	UNUSED_4	none
5	Build Time	number
6	NgOnInit Count	number
7	Initial Chunk Size	number
8	Total Chunk Count	number
9	Total Chunk Size	number
10	Lazy Chunk Count	number
11	Lazy Chunk Size	number
12	Asset Count	number
13	Asset Size	number
14	Polyfill Size	number
15	Css Size	number

Operating System and Node Version

A User Agent string is built to "fool" Google Analytics into reading the Operating System and version fields from it. The base dimensions are used for those.

Node version is our App ID, but a dimension is also used to get the numeric MAJOR.MINOR of node.

Debugging

Using DEBUG=ng:analytics will report additional information regarding initialization and decisions made during the usage analytics process, e.g. if the user has analytics disabled.

Using DEBUG=ng:analytics:command will show the decisions made by the command runner.

Using DEBUG=ng:analytics:log will show what we actually send to GA.

See the debug NPM library for more information.

Disabling Usage Analytics

There are 2 ways of disabling usage analytics:

1. using ng analytics off --global (or changing the global configuration file yourself). This is the same as answering "No" to the prompt.
2. There is an NG_CLI_ANALYTICS environment variable that overrides the global configuration. That flag is a string that represents the User ID. If the string "false" is used it will disable analytics for this run.