Key Event Tracking (GA4)

Configuration of the actions that signal business value, called key events in GA4. Correct tracking is the foundation of reporting and automated bidding.

ID: MK-T0605
Tactic: Measurement & KPIs
Sub-techniques: 3
Type: How-to
Level: Beginner
Time: 2–4 hours

Sub-techniques

ID	Name
MK-T0605.001	Measurement Plan
MK-T0605.002	GTM Trigger Setup
MK-T0605.003	Ads Conversion Import

When to use

New site or new GA4 property
Reported conversions do not match CRM leads

Procedure

Write a measurement plan: three to five actions, each with event name, trigger and value.
In GTM, create a trigger on the success state: a confirmation page view or a success element.
Create a GA4 event tag, using recommended event names such as generate_lead or purchase.
Test with GTM Preview and GA4 DebugView, then publish the container.
In GA4 Admin, mark the event as a key event and set a default value if known.
Link GA4 to Google Ads, import key events and set optimization targets as primary.

Verify / Metrics

Key event counts within a reasonable range of CRM leads for the same period
No duplicate events for a single submission

Common mistakes

Mistake	Mitigation
Triggering on button click instead of success	Trigger on confirmed success
Double counting through GA4 import plus the Ads tag	One source of truth per action
Marking engagement events as key events	Reserve key events for business outcomes

Sub-technique details

MK-T0605.001

Measurement Plan

Three to five actions, each with event name, trigger and value.

MK-T0605.002

GTM Trigger Setup

Triggers that fire on confirmed success, not on button clicks.

MK-T0605.003

Ads Conversion Import

Importing GA4 key events into Google Ads as optimization targets.

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