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Right after you connect Google Ad Manager, the dashboard is still empty. This page explains what Stealth does in the first hour and the first days, and when you can expect numbers and alerts.

How it works

Stealth works in hourly checks. Each check reads new data from every connected network, updates the dashboard and looks for drops. There is one check every hour, around 20 minutes past the hour.

The first hour

The next hourly check reads the networks for the first time. Until then, each network shows Preparing in the Control Center (“Waiting for the first check (up to 1 hour)”).

The first day: loading history

To know what is normal for each ad unit, Stealth needs history. After the first check, it loads the last 28 days of each network, newest day first. The network shows Loading history with the progress in days. Loading uses the time left in each hourly check, so it is spread over several checks. The list of clients and the link between clients and ad units come from a daily report that Google Ad Manager closes in the morning. Clients appear after the first daily report of each network, from 07:00 in the network’s time zone.

When numbers and alerts start

With the 28 days loaded, all of these are available. Until then, cards show No normal yet and no alert is opened for the hours without enough history.
Google Ad Manager data for an hour is not final right away, so each check evaluates the hour that started 2 hours earlier. An ad unit also has to be silent for 2 hours in a row before it becomes an incident. An ad unit that stops at 10:00 is therefore detected by the check at about 13:20. Daily data for yesterday is read from 06:00 in the network’s time zone.

What is monitored by default

  • Every imported network is monitored.
  • Clients in the Brazil category are monitored. Clients of the Global team and Apps are not. You can change this in the Control Center.

What you see

In the Control Center, each network moves through these stages: Settings > General shows the same information for the whole organization: Not monitoring, Preparing, Monitoring or Needs attention.

FAQ

An Owner or Administrator can choose Check now in the Control Center. The check starts within 5 minutes. It refreshes the data, but hourly alerts are only evaluated in the regular hourly check.
On Today, the comparison with normal starts after 3 complete hours of the day. Choose Yesterday to see a full day.
No. Detection looks at the most recent hours and days. The history is only used to learn what is normal.
Last modified on October 20, 2026