Limits

Every limit here is enforced by the OnCallAlerting server. Character counts are characters unless the table says bytes. Rate limits count requests in one-minute windows.

Organization and accounts

Item	Limit
Your name, organization name	1-100 characters
Email address	Up to 254 characters, one account per address
Password	12-72 bytes
Invitation link	Expires after 72 hours, works once
Session	7 days
Sign-in, signup, accepting an invitation	10 per minute per address

Rosters

Item	Limit
Roster name	1-100 bytes
Simple rotation length	1-90 days
People in a simple rotation	1-100
Layers per roster	Up to 20
Layer name	1-100 bytes
People per layer	1-100 turns (a person can take several)
Layer rotation	1-365 days or 1-2160 hours
Restrictions per layer	Up to 50
Working shifts per follow-the-sun roster	Up to 24
Wait before paging the primary	1-60 minutes
Substitution length	Up to 90 days, ending in the future
Substitution reason	Up to 500 bytes
Substitutions per roster	Up to 500, including past ones, with no overlaps
Schedule preview	1-42 days per request. The editor shows 7 days.

Escalation policies

Item	Limit
Policy name	1-100 bytes
Levels	1-10
Rosters and people per level	1-10
Wait per level	1-1440 minutes
Repeat the whole policy	0-9 more times
Channel per level	In-app inbox, or Slack + in-app

Alert sources and intake

Item	Limit
Source name	1-100 bytes
Alerts per source	240 per minute, across the webhook and compatible APIs
Requests to one webhook URL	240 per minute per address
Unknown integration keys	60 per minute per address
Test alerts	30 per minute per address
Webhook body	1 MB
PagerDuty- and Opsgenie-compatible body	512 KB
Alerts in one Alertmanager or Grafana webhook	1-100
Title (native and generic webhooks)	1-300 bytes, else rejected
Title (compatible APIs)	Shortened to 300 characters
Description	Up to 10000 characters
Deduplication key (native and generic webhooks)	1-500 bytes
dedup_key, incident_key (PagerDuty-compatible)	Up to 255 characters
payload.summary (PagerDuty-compatible)	Up to 1024 characters
alias (Opsgenie-compatible)	Up to 512 characters
Tags kept (Opsgenie-compatible)	First 20
Details per incident	50 keys, each key up to 100 characters, each value up to 2000 characters
Links per incident	20, http or https, each up to 2000 characters
Change events	Kept 90 days. The workspace shows the 50 most recent; a source shows 10.
Opsgenie request status	Kept 3 days

Incidents

Item	Limit
Incidents listed in the workspace	The 500 most recent
Activity timeline	The 500 most recent entries
Note	1-2000 characters
Notes per incident	Up to 100
Snooze	5-1440 minutes
Incidents per merge	1-20
Merged incidents per incident	Up to 200, including nested merges
Rosters and people per responder request	1-10
Responder requests per incident	Up to 50

Heartbeats

Item	Limit
Name	1-100 bytes, unique in the organization
Interval	1 minute to 30 days (43200 minutes)
Severity	critical, warning (default) or info
Pings	60 per minute per heartbeat, and 240 per minute per address

Notifications

Item	Limit
Slack attempts	Up to 6
Slack attempt timeout	8 seconds
Slack retry waits	About 30 seconds, 2 minutes, 10 minutes, 30 minutes, 1 hour, each +-20%, and at least Retry-After up to 1 hour
Attempts kept per notification	The last 20
Notifications in an incident's delivery log	Up to 1000
Slack connections per organization	1

Outbound webhooks

Item	Limit
Webhooks per organization	Up to 10
Name	1-100 characters
URL	Up to 2000 characters, https, no credentials or fragment, public address
Attempts per event	8, over about 3 hours 40 minutes
Test ping	1 attempt; 30 tests per minute per address
Attempt timeout	10 seconds
Response read	Up to 64 KB
Consecutive failures before auto-disable	20, or at once on 410 Gone
Previous secret still signs after rotation	24 hours
Signature timestamp tolerance to check	5 minutes
Deliveries shown	The 50 most recent
Deliveries kept	30 days
Attempts kept per delivery	The last 20

Requests to the workspace

Item	Limit
Any request body	1 MB
Workspace refresh	Every 15 seconds