Channels

A channel is a reusable destination an alert or synthetic check can notify — a list of email recipients or a Slack webhook. Channels live on the Channels page in the LeanSignal app — in the sidebar, or via the Manage Channels button on the Alerts and Synthetics pages — and one channel can serve any number of alert rules and checks.

Create a channel

Press Add channel (editor or admin role), name it (for example On-call email), and pick a type:

• Email — add up to 10 recipients. Each recipient shows an eligibility status (see below).
• Slack — paste the Webhook URL of a Slack incoming webhook (https://hooks.slack.com/services/…). The URL is masked after saving, like a credential.

Channels have an Enabled toggle — a disabled channel stays attached to its rules but delivers nothing, which is useful for silencing one destination without touching every rule.

Email recipients must be verified

LeanSignal only emails addresses that have consented, so each recipient in an email channel carries a status chip:

Status	Meaning	Action
Enabled	Eligible — notifications are delivered.	—
Awaiting verification	A verification email was sent; the recipient hasn’t confirmed yet.	Resend
Not verified	No verification email has gone out yet.	Resend
Unsubscribed	The recipient unsubscribed via a link in a LeanSignal email.	Re-invite
Blocked by user	The person opted out of LeanSignal emails. Opt-out always wins.	—

How eligibility works: members of your tenant are eligible by default (unless they opt out under Preferences). An outside address gets a verification email with a confirmation link; only after the recipient confirms does it become eligible. Resend issues a fresh verification email (up to three times per recipient).

Tip

Add recipients well before you need them — an alert that fires while its only recipient is still Awaiting verification delivers nothing.

Test a channel

Open a channel and press Send test:

• Email channels send a test notification through the normal delivery path — eligible recipients receive it.
• Slack channels post a test message (“LeanSignal test — this Slack webhook works.”) directly to the webhook, so you get an immediate Sent — check your Slack channel or Could not reach the webhook URL result.

Attach channels to alerts

Channels do nothing on their own — select them in each alert rule’s Channels list (see Alerting). Remember the invariant: a rule with no channel is kept paused, and imported rules from the integrations catalog arrive that way. Deleting a channel doesn’t delete the rules that used it, but they stop notifying through it — and a rule left with zero channels pauses.

Next steps

• Alerting — the rules that deliver through these channels.
• Synthetics — uptime checks that also deliver through these channels.
• Manage users — personal email opt-out preferences.