How can you tell what treatment a user will see?

There are three primary use cases for determining "who is seeing which treatment" that can be answered in Split:

This question is often asked to validate the rollout plan when a Split is changed. You can answer this question by going to the "Key Page".  Here's an example:

In this image, you can see that the user "bilal" will see the "off" treatment for the "aa_test" split every time they log in, based on the current rollout plan. Similarly, they will see the "show_text" treatment for "front_end_show_more_info". 

• This view will only show you treatments for Splits that are not using attributes for targeting. This is because for data privacy reasons, Split does not copy attribute values to the Split cloud. So, we do not know the value of a specific attribute for user "bilal".
• The key "bilal" is just for demonstration purposes. It will typically be a database id or a cookie id.

• You can get to the key page either by searching for that key (say "bilal") in the search box near the top left corner of the app, above ("My Work").
• You can also click on the key id in Live Tail, once paused, or the Datahub to get to the key page. 

You can answer this question by going to Datahub. See this example:

Here, you are searching for a specific key (say user id).  Split fetches the live treatments that are being assigned right now.  For instance, the key "b5181890-686d-11e9-8af6-0a1c02136776" is seeing treatment "on" for "es_disable_impressions" and "data_hub_live_tail" while seeing treatment "performance" for "group_by_event_type

• Since this is a live tail of logs, this query will only show you results starting from when you issued the query. It will not show you events from the past. If you want to query historical data you can use the Data export tab in Data hub.
• Also, given the size of the data we are searching for, there is an initial lag in the query response of about 10 seconds. 

• You can click on the "Data hub" in the side navigation to get to this page.
• If you are on a split page, you can also click on "Live Tail" tab to get a filtered view of impressions for that specific split.