debian-mirror-gitlab/doc/development/snowplow/event_dictionary_guide.md

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---
stage: Growth
group: Product Intelligence
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
---
# Event dictionary guide
NOTE:
The event dictionary is a work in progress, and this process is subject to change.
This guide describes the event dictionary and how it's implemented.
## Event definition and validation
This process is meant to document all Snowplow events and ensure consistency. Event definitions must comply with the [JSON Schema](https://gitlab.com/gitlab-org/gitlab/-/blob/master/config/events/schema.json).
All event definitions are stored in the following directories:
- [`config/events`](https://gitlab.com/gitlab-org/gitlab/-/tree/master/config/events)
- [`ee/config/events`](https://gitlab.com/gitlab-org/gitlab/-/tree/master/ee/config/events)
Each event is defined in a separate YAML file consisting of the following fields:
| Field | Required | Additional information |
|------------------------|----------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `description` | yes | A description of the event. |
| `category` | yes | The event category (see [Structured event taxonomy](index.md#structured-event-taxonomy)). |
| `action` | yes | The event action (see [Structured event taxonomy](index.md#structured-event-taxonomy)). |
| `label_description` | no | A description of the event label (see [Structured event taxonomy](index.md#structured-event-taxonomy)). |
| `property_description` | no | A description of the event property (see [Structured event taxonomy](index.md#structured-event-taxonomy)). |
| `value_description` | no | A description of the event value (see [Structured event taxonomy](index.md#structured-event-taxonomy)). |
| `extra_properties` | no | The type and description of each extra property sent with the event. |
| `identifiers` | no | A list of identifiers sent with the event. Can be set to one or more of `project`, `user`, or `namespace`. |
| `iglu_schema_url` | no | The URL to the custom schema sent with the event, for example, `iglu:com.gitlab/gitlab_experiment/jsonschema/1-0-0`. |
| `product_section` | yes | The [section](https://gitlab.com/gitlab-com/www-gitlab-com/-/blob/master/data/sections.yml). |
| `product_stage` | no | The [stage](https://gitlab.com/gitlab-com/www-gitlab-com/blob/master/data/stages.yml) for the event. |
| `product_group` | yes | The [group](https://gitlab.com/gitlab-com/www-gitlab-com/blob/master/data/stages.yml) that owns the event. |
| `product_category` | no | The [product category](https://gitlab.com/gitlab-com/www-gitlab-com/blob/master/data/categories.yml) for the event. |
| `milestone` | no | The milestone when the event is introduced. |
| `introduced_by_url` | no | The URL to the merge request that introduced the event. |
| `distributions` | yes | The [distributions](https://about.gitlab.com/handbook/marketing/strategic-marketing/tiers/#definitions) where the tracked feature is available. Can be set to one or more of `ce` or `ee`. |
| `tiers` | yes | The [tiers]( https://about.gitlab.com/handbook/marketing/strategic-marketing/tiers/) where the tracked feature is available. Can be set to one or more of `free`, `premium`, or `ultimate`. |
### Example event definition
The linked [`uuid`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/config/events/epics_promote.yml)
YAML file includes an example event definition.
```yaml
description: Issue promoted to epic
category: epics
action: promote
property_description: The string "issue_id"
value_description: ID of the issue
extra_properties:
weight:
type: integer
description: Weight of the issue
identifiers:
- project
- user
- namespace
product_section: dev
product_stage: plan
product_group: group::product planning
product_category: epics
milestone: "11.10"
introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/10537
distributions:
- ee
tiers:
- premium
- ultimate
```
## Create a new event definition
Use the dedicated [event definition generator](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/generators/gitlab/snowplow_event_definition_generator.rb)
to create new event definitions.
The `category` and `action` of each event are included in the filename to enforce uniqueness.
The generator takes three options:
- `--ee`: Indicates if the event is for EE.
- `--category=CATEGORY`: Indicates the `category` of the event.
- `--action=ACTION`: Indicates the `action` of the event.
- `--force`: Overwrites the existing event definition, if one already exists.
```shell
bundle exec rails generate gitlab:snowplow_event_definition --category Groups::EmailCampaignsController --action click
create create config/events/groups__email_campaigns_controller_click.yml
```