Add Person activity to email alert

You can sort of do this today with some minimal customization:

Create an "Interesting Moments History" field (text field, not string).  Then include an additional flow step (#3 in the screenshot below) within each IM trigger campaign that you want to include in the history field:

NOTE: We also increment an IM score field as part of this process.

The full value of the concatenated field is as follows:

{{lead.Last Interesting Moment Date}}: {{lead.Last Interesting Moment Desc}}{{my.line-break}}{{lead.Avanade Interesting Moment History}}

And the "line-break" token that's used is achieved by using @Sanford Whiteman​'s approach, documented here:

http://blog.teknkl.com/dark-mkto-alleys-line-break-token/  (don't be intimidated by the amount of detail here; as long as you follow the step-by-step instructions, it's actually very easy to implement.  Also, we implemented this at the folder level of all of our operational programs/campaign - which enables you to only create this once and use the {{my.line-break}} token in as many programs/campaigns within that folder).

You can now insert the {{lead.Interesting Moments History}} field as a token in your alerts.

@sanfordwhiteman - we pull tokens through to Slack alerts via webhook, I've tried adding the IM history & web history tokens to our slack alerts but it doesn't seem to recognise it and doesn't pull any info through... presume this is because it is a custom  "My Token" defined within a program rather than a system-level token? Any work-arounds to get this to feed through to slack?

There's no reason a {{my.token}} won't be sent with a webhook, as long as the Call Webhook step is inside/inherits from the place the {{my.token}} is defined.

is it really a {{my.token}} though? A person-specific history field would be a {{lead.token}} (which also will be sent in a webhook).

@sanfordwhiteman true but if I used the {{lead.token}} wouldn't I be faced with the same issue of a long list of every single action recorded instead of the most recent N values?

I guess I wanted to use the {{my.token}} as it is an appending log with line breaks.... 

Is it a Velocity {{my.token}}? I don't understand any other way that what you're saying could be true -- that the {{my.token}} reflects lead-level values.