Feature request: Dimension metric abnormalities

Great news: We may soon have an Exclude by dimensions tool, which will help bot visits from getting registered as regular visits, offering to identify and block them via dimensions, such as resolution, country and browser version:

• #162

We could help the user with these tasks:

1. Discover relevant dimension patterns of cloaked bots
2. Create "Exclude by dimension"-rules to block bot visits

Proposal

Cloaked bots usually share certain dimensions, like resolution, country and browser version, and we could offer a new "Dimension metric abnormalities"-widget to more easily discover these dimensions, and make a Matomo administrator aware of the characteristics of a potential bot attack.

Dimension metric abnormalities widget

All dimensions could be monitored behind the scenes, and if a dimension metric (like a specific resolution) makes a huge jump, it would be immediately obvious.

It could be exposed in a new Dashboard widget like below, which admins can add to the front page:

Dimension metric abnormalities

Dimension	Unique visitors
Resolution: 375x812	+2.100%
Configuration: Chrome Mobile	+1.160%
Country: Bangladesh	+890%
Country: Myanmar	+610%
Country: USA	+20%

Create Dimension metric abnormalities rule link

At the bottom of the widget, there could be a "Create Exclude by dimension rule with top 3" link to the new "Exclude by dimensions"-feature, with these value pre-selected, ready to click "Save":

Resolution: 375x812
--AND
Configuration: Chrome Mobile
--AND
Country: Bangladesh

The link could be something along these lines:
https://example.org?segment=resolution==375x812;countryName==Bangladesh;browserName==Chrome%2520Mobile&method=TrackingSpamPrevention.setDataSubjects

Since Myanmar (number 4) is also relevant, the preset rule under the TrackingSpamPrevention section could be expanded to include that as well by the admin like this:

Resolution: 375x812
--AND
Configuration: Chrome Mobile
--AND
--Country: Bangladesh
----OR
--Country: Myanmar

Comienza revisando el trabajo relacionado con exclude-by-dimensions en #162 y el punto de entrada TrackingSpamPrevention.setDataSubjects mencionado en la propuesta. Define cómo debe detectar y mostrar el widget del dashboard de anomalías de la métrica Dimension los valores anómalos de Dimension, y cómo su enlace de los tres principales debe preseleccionar las reglas de exclusión. Se considera completado cuando el widget, el enlace a las reglas y la agrupación de países controlada por el administrador funcionan conjuntamente como se describe.