Amplitude custom monitors spot when a metric moves. FlowMattic receives each alert through a webhook and posts it to Slack, routed by monitor, explained in plain words and sent to whoever is on call when the drop is serious. For growth, product and data teams who track key metrics in Amplitude.
1 trigger 14 actions 6 example workflows 2 ready-made templates Unlimited runs
When this happens in Amplitude1 trigger
Do this in Slack14 actions
1. TriggerSetup Webhook2. ActionSend Channel MessageWhen Amplitude fires Setup Webhook, FlowMattic runs Send Channel Message in Slack with the data from that event.
You build this in the FlowMattic workflow builder on your own site. See the setup steps
Each one uses only triggers and actions the two integrations ship today, plus FlowMattic's own tools. Where the library has a ready-made template, import it instead of building from scratch.
Ready-made templateEach alert posts the monitor name, metric and change to the analytics channel, so the team sees a spike or drop without opening a dashboard.
Setup WebhookSend Channel Message
View the template A Router reads the monitor name, so signup alerts go to growth, checkout alerts go to payments and error-rate alerts go to engineering.
Setup WebhookRouterSend Channel Message
A Branch checks how far the metric fell. Big drops go to the on-call engineer by DM, smaller changes only to the channel.
Setup WebhookBranchSend Direct Message
An AI Agent turns the monitor payload into a short note on what changed and what to check first, so people outside the data team understand it.
Setup WebhookAI AgentSend Channel Message
Set Channel Topic writes the last monitor that fired and when, so anyone opening the metrics channel sees the current state first.
Setup WebhookSet Channel Topic
Date/Time Formatter reads the alert time and a Filter stops minor monitors at night, so people are not woken for small weekend changes.
Setup WebhookDate/Time FormatterFilterSend Channel Message
At the end, each Amplitude custom monitor that fires posts its details to your Slack channel.
Under Connects in FlowMattic, add the Slack workspace that should receive alerts.
Create a workflow with Amplitude and Setup Webhook, then copy the URL FlowMattic gives you.
In Amplitude, add that URL as the webhook for your custom monitor and send a test alert so FlowMattic captures the payload.
Add Slack Send Channel Message, choose the channel, map the monitor name, metric and values, test it and switch the workflow on.
1. Trigger in Amplitude
Setup Webhook
2. Action in Slack
Send Channel Message
Fields mapped from the earlier steps (a typical setup)
| From Amplitude | To Slack |
|---|---|
| Monitor name | Message: monitor |
| Metric | Message: metric |
| Current value | Message: now |
| Expected value | Message: expected |
| Chart link | Message: chart |
A trigger starts a workflow. An action is something FlowMattic does in the app as a step.
Amplitude and Slack connect through FlowMattic on your own site, with no separate automation account in the middle and no charge per run.
Each monitor goes to the team responsible for that metric, so alerts are acted on rather than muted.
AI explanations and clear formatting make alerts useful to product and marketing, not only analysts.
FlowMattic catches the webhook on your WordPress site with unlimited runs, so noisy monitors cost nothing extra.
Create a FlowMattic workflow with the Amplitude Setup Webhook trigger, paste its URL into your custom monitor's webhook setting in Amplitude, then add Slack Send Channel Message with the alert fields mapped.
Yes. Point them all at the same webhook URL and add a Router that checks the monitor name, with a Slack step and channel on each path.
Yes. Format the alert time with Date/Time Formatter and add a Filter that stops low-priority monitors outside working hours. Keep severe monitors on a path that always posts.
This trigger is built for Amplitude custom monitors. For other events, use a FlowMattic Webhook trigger with whatever Amplitude can send to a URL.
Yes. Use Find User by Email for the on-call person and include their Slack ID in the message, or reach them directly with Send Direct Message.
Did not find your answer? You can browse the help center or ask us directly.
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Reviewed 27 Oct 2026. The example workflows are written with AI from the real triggers and actions of both integrations and checked against them. Amplitude integration 1.0.0, Slack integration 1.0.
