During Enrichment your events have extra properties and values attached to them, also know as dimension widening.
Snowplow enrichments can be categorized into three brackets:
- Hardcoded enrichments loading
- Configurable enrichments loading
- Configurable enrichments adding new contexts to the
Legacy enrichments are those which populate
atomic.events table as opposed to dedicated enrichment tables. The hardcoded legacy enrichments normally take place as part of common enrichment process and they precede configurable enrichments. During the common enrichment process the data received from collector(s) is mapped according to our Canonical Event Model.
Configurable enrichments often depend on the data produced by the common enrichment process.
The following fields are populated depending on whether the tracker provided the corresponding value or not.
|Raw Parameter||Enriched Parameter||Purpose|
|The unique event identifier (UUID). Assigned during enrichment if not provided with |
|User ID set by Snowplow using 3rd party cookie. Overwriten with tracker-set |
|Snowplow collectors log IP address as standard. However, you can override the value derived from the collector by populating this value in the tracker.|
|Raw useragent (browser string). Could be overwritten with |
The following fields are populated depending on the collector and ETL (Extract, Transform, Load) utilized in the pipeline.
|Host ETL version|
|Timestamp event began ETL|
|Time stamp for the event recorded by the collector|
The raw parameter
res (if present) representing the screen/monitor resolution and coming in as a combination of width and height (ex.
1280x1024) is broken up into separate entities.
|Screen / monitor width|
|Screen / monitor height|
url parameter provides the value for
atomic.events, which represents the current page’s URL. The following parts are extracted and populate separate fields as outlined below.
|Scheme (protocol), ex. “http”|
|Host (domain), ex. “www.snowplowanalytics.com”|
|Port if specified, 80 if not|
|Path to page, ex. “/product/index.html”|
|Querystring, ex. “id=GTM-DLRG”|
|Fragment (anchor), ex. “4-conclusion”|
page_referrer gets the value from
refr, which represents the referer’s URL, and the following parts are extracted and populate separate fields as shown below.
|Port if specified, 80 if not|
|Path to page|
Additionally the derived timestamp is calculated,
derived_tstamp. See this blog post for more details.
Finally, contexts, unstructured events and the relevant configurable enrichments (if enabled) are validated against their corresponding JSON schemas and the array of the derived contexts is assembled.
All configurable enrichments are listed on the Available Enrichments page.
The following configurable enrichments write data into
atomic.events table (legacy enrichments):
- IP anonymization enrichment
- IP lookups enrichment
- Campaign attribution enrichment
- Currency conversion enrichment
- referer-parser enrichment
- Event fingerprint enrichment
All other configurable enrichments create a separate context and thus are loaded into their own dedicated tables.