At a glance
Funnel Conversion Drop (>5pp in 24h) is a real-time alert card in Nerve Centre that fires when your primary Amplitude funnel loses more than 5 percentage points of end-to-end conversion inside a 24-hour window. A sudden drop of that size is rarely organic. It usually points to a broken checkout step, a payment outage, a deploy that changed a button or form, or a tracking regression that is quietly dropping events. The card counts how many such alerts are currently active so you can triage fast before the lost conversion compounds into lost revenue.
| What it counts | The count of active alerts where the primary funnel conversion rate has fallen by more than 5 percentage points within a 24-hour period, measured from Amplitude funnel data. |
| Sample type | Real-time alert evaluation against Amplitude funnel conversion data, refreshed continuously in Nerve Centre. |
| Why it matters | A multi-point conversion drop inside a day is a revenue emergency. Catching it in real time lets you intervene before a full day of traffic converts at the lower rate. |
| Reading the value | A value above zero means one or more drop conditions are live. Open the alert to see which funnel and which step moved, then act on the underlying cause. |
| Currency | count |
| Time window | RT |
| Alert trigger | primary funnel conversion down >5pp in 24h |
| Sentiment key | amp_alert_conversion_drop |
| Roles | owner, marketing |
Calculation
Nerve Centre evaluates your primary Amplitude funnel’s end-to-end conversion rate on a rolling basis and compares the current 24-hour reading against the prior comparable window. When the conversion rate falls by more than 5 percentage points, the alert fires and is added to the active count shown on this card. The card value is the number of such alerts currently open. See the At a glance summary above for what the card tracks and the worked example below for a typical reading.Worked example
A representative reading of Funnel Conversion Drop (>5pp in 24h) for a typical merchant on Amplitude. Yesterday the checkout funnel converted at 3.8 percent end to end. By midday on 14 Mar 26 the same funnel was running at 2.1 percent, a fall of 1.7 points, then slid to 2.0 percent. That crosses the threshold for the day-on-day comparison the card uses, so the alert fires and the card reads 1. The team opens the alert and sees the drop concentrated at the payment step, which lines up with a payment-gateway timeout that started that morning. Vortex Mind traces the regression to a failed gateway health check rather than a tracking gap, and Ask Viq is used to ask, in plain English, how much revenue was lost during the affected hours so the team can prioritise the fix and the recovery.Sibling cards merchants should reference together
| Card | Why merchants reach for it |
|---|---|
amp_funnel_conversion | Shows the underlying funnel conversion rate this alert watches. |
amp_funnel_step_dropoff | Pinpoints which step is leaking when the alert fires. |
amp_alert_event_volume_drop | Confirms whether the drop is real or a tracking volume issue. |
amp_alert_tracking_broken | Rules out a stopped core event as the cause. |
amp_health_score | Gives overall instrumentation confidence behind the funnel data. |
Reconciling against Amplitude
Where to look in Amplitude’s own dashboard: Open the Funnels report for your primary conversion path and set the comparison to day over day. Amplitude’s own anomaly detection and Alerts can also be configured on the funnel conversion rate; compare what Nerve Centre flagged against Amplitude’s funnel trend and any native alert that fired in the same window. Confirm the funnel definition, the conversion window, and the segment match the Vortex IQ profile before concluding the readings disagree. Why the Vortex IQ value may legitimately differ:| Reason | Direction | What to do |
|---|---|---|
| Period boundary. Nerve Centre evaluates a rolling 24-hour window; Amplitude funnels may be viewed on calendar-day boundaries. | Variable | Align both to the same 24-hour window. |
| Time zone. Amplitude uses the project time zone; Vortex IQ aligns to the merchant reporting time zone. | Marginal | Confirm time zone match. |
| Filter and segment scope. Profile-level filters (channel, device, test traffic) can narrow the funnel the alert evaluates. | Variable | Match segment and filter settings. |