Read SIGNL4 alerts, teams, users and duty schedules; raise, acknowledge, close and annotate alerts.
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WRITE: acknowledge an alert on behalf of a SIGNL4 user (recorded in its history under that user). Stops escalation to further tiers for that alert. POST /v3/signls/{signlId}/acknowledge.
The SIGNL4 user the acknowledgement is recorded for; see signl4_list_users.
Alert (signl) id; get it from signl4_list_alerts or the id returned by signl4_raise_alert.
Optional comment stored with the acknowledgement.
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WRITE: acknowledge an alert on behalf of a SIGNL4 user (recorded in its history under that user). Stops escalation to further tiers for that alert. POST /v3/signls/{signlId}/acknowledge.
| Argument | Type | Description |
|---|---|---|
| comment | string | Optional comment stored with the acknowledgement. |
| user_id* | string | The SIGNL4 user the acknowledgement is recorded for; see signl4_list_users. |
| alert_id* | string | Alert (signl) id; get it from signl4_list_alerts or the id returned by signl4_raise_alert. |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"alert_id",
"user_id"
],
"properties": {
"comment": {
"type": "string",
"maxLength": 2000,
"description": "Optional comment stored with the acknowledgement."
},
"user_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "The SIGNL4 user the acknowledgement is recorded for; see signl4_list_users."
},
"alert_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "Alert (signl) id; get it from signl4_list_alerts or the id returned by signl4_raise_alert."
}
}
}WRITE: add a text note to an alert's timeline on behalf of a SIGNL4 user. The note is visible to the team in the app. It does not page anyone by itself. POST /v3/signls/{signlId}/annotate.
| Argument | Type | Description |
|---|---|---|
| text* | string | The note. |
| user_id* | string | The SIGNL4 user the note is recorded for; see signl4_list_users. |
| alert_id* | string | Alert (signl) id; get it from signl4_list_alerts or the id returned by signl4_raise_alert. |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"alert_id",
"user_id",
"text"
],
"properties": {
"text": {
"type": "string",
"maxLength": 4000,
"minLength": 1,
"description": "The note."
},
"user_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "The SIGNL4 user the note is recorded for; see signl4_list_users."
},
"alert_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "Alert (signl) id; get it from signl4_list_alerts or the id returned by signl4_raise_alert."
}
}
}WRITE: close (resolve) an alert on behalf of a SIGNL4 user; it leaves the open list and stops all further notifications. POST /v3/signls/{signlId}/close.
| Argument | Type | Description |
|---|---|---|
| comment | string | Optional comment stored with the closure. |
| user_id* | string | The SIGNL4 user the closure is recorded for; see signl4_list_users. |
| alert_id* | string | Alert (signl) id; get it from signl4_list_alerts or the id returned by signl4_raise_alert. |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"alert_id",
"user_id"
],
"properties": {
"comment": {
"type": "string",
"maxLength": 2000,
"description": "Optional comment stored with the closure."
},
"user_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "The SIGNL4 user the closure is recorded for; see signl4_list_users."
},
"alert_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "Alert (signl) id; get it from signl4_list_alerts or the id returned by signl4_raise_alert."
}
}
}Full detail of one alert: title, text, severity, category, status and delivery status, history (who acknowledged/closed it and when), parameters, attachments and escalations with per-user delivery. GET /v3/signls/{signlId}/details.
| Argument | Type | Description |
|---|---|---|
| alert_id* | string | Alert (signl) id; get it from signl4_list_alerts or the id returned by signl4_raise_alert. |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"alert_id"
],
"properties": {
"alert_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "Alert (signl) id; get it from signl4_list_alerts or the id returned by signl4_raise_alert."
}
}
}Alert volume and response statistics per team over several time periods: acknowledged, closed and unhandled counts, overall and per category (optionally for one user). Teams that cannot be read are reported under `errors`. GET /v3/signls/report.
| Argument | Type | Description |
|---|---|---|
| user_id | string | Report for this user only. |
| team_ids | array | Limit to these team ids (default: all teams the key can access). |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"user_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "Report for this user only."
},
"team_ids": {
"type": "array",
"items": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "SIGNL4 team id (a GUID); get it from signl4_list_teams."
},
"maxItems": 50,
"description": "Limit to these team ids (default: all teams the key can access)."
}
}
}The ordered timeline of an alert: creation, notifications, acknowledgements, annotations, escalations and remote actions. GET /v3/signls/{signlId}/timeline.
| Argument | Type | Description |
|---|---|---|
| alert_id* | string | Alert (signl) id; get it from signl4_list_alerts or the id returned by signl4_raise_alert. |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"alert_id"
],
"properties": {
"alert_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "Alert (signl) id; get it from signl4_list_alerts or the id returned by signl4_raise_alert."
}
}
}Whether a user is currently on or off duty in each of their teams (dutyMode, onDutyTime, tier). GET /v3/users/{userId}/dutyStatus.
| Argument | Type | Description |
|---|---|---|
| user_id* | string | SIGNL4 user id (a GUID); get it from signl4_list_users. |
| team_ids | array | Limit to these team ids (default: all teams the key can access). |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"user_id"
],
"properties": {
"user_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "SIGNL4 user id (a GUID); get it from signl4_list_users."
},
"team_ids": {
"type": "array",
"items": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "SIGNL4 team id (a GUID); get it from signl4_list_teams."
},
"maxItems": 50,
"description": "Limit to these team ids (default: all teams the key can access)."
}
}
}Duty assistant info per team: whether it is enabled and the last two (or all) duty periods. GET /v3/duties/summary.
| Argument | Type | Description |
|---|---|---|
| team_ids | array | Limit to these team ids (default: all teams the key can access). |
| last_two_only | boolean | Only the last two duties (default true). |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"team_ids": {
"type": "array",
"items": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "SIGNL4 team id (a GUID); get it from signl4_list_teams."
},
"maxItems": 50,
"description": "Limit to these team ids (default: all teams the key can access)."
},
"last_two_only": {
"type": "boolean",
"description": "Only the last two duties (default true)."
}
}
}One SIGNL4 team: name, description, time zone, member ids. GET /v3/teams/{teamId}.
| Argument | Type | Description |
|---|---|---|
| team_id* | string | SIGNL4 team id (a GUID); get it from signl4_list_teams. |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"team_id"
],
"properties": {
"team_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "SIGNL4 team id (a GUID); get it from signl4_list_teams."
}
}
}One SIGNL4 user: name, e-mail, contact addresses, time zone and duty status per team. GET /v3/users/{userId}.
| Argument | Type | Description |
|---|---|---|
| user_id* | string | SIGNL4 user id (a GUID); get it from signl4_list_users. |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"user_id"
],
"properties": {
"user_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "SIGNL4 user id (a GUID); get it from signl4_list_users."
}
}
}Search SIGNL4 alerts (signls), newest first, with status, severity, category and history (created, acknowledged, closed). Filter by team, status, creation time, text or external id. Up to 100 per page; pass the returned continuation_token to get the next page. POST /v3/signls/paged (a read).
| Argument | Type | Description |
|---|---|---|
| text | string | Free-text search in title and text. |
| status | string | Only alerts in this state (default: all). |
| team_ids | array | Limit to these team ids (default: all teams the key can access). |
| external_id | string | Only alerts raised with this external id. |
| max_results | integer | Alerts per page, 1-100 (default 25). |
| category_ids | array | Only alerts of these category ids (see signl4_list_categories). |
| created_after | string | ISO 8601 date-time with a timezone, e.g. 2026-10-01T00:00:00Z. |
| created_before | string | ISO 8601 date-time with a timezone, e.g. 2026-10-01T00:00:00Z. |
Audit log of changes and events in the SIGNL4 subscription (who changed what, when). Filter by team, time window and message text; pass the returned continuation_token for the next page. GET /v3/audits.
| Argument | Type | Description |
|---|---|---|
| to | string | ISO 8601 date-time with a timezone, e.g. 2026-10-01T00:00:00Z. |
| from | string | ISO 8601 date-time with a timezone, e.g. 2026-10-01T00:00:00Z. |
| team_ids | array | Limit to these team ids (default: all teams the key can access). |
| max_results | integer | Entries per page, 1-200 (default 50). |
| message_contains | string | Only entries whose message contains this text. |
| continuation_token | string | The continuation_token of the previous page. |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"to": {
"type": "string",
"description": "ISO 8601 date-time with a timezone, e.g. 2026-10-01T00:00:00Z."
},
"from": {
"type": "string",
"description": "ISO 8601 date-time with a timezone, e.g. 2026-10-01T00:00:00Z."
},
"team_ids": {
"type": "array",
"items": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "SIGNL4 team id (a GUID); get it from signl4_list_teams."
},
"maxItems": 50,
"description": "Limit to these team ids (default: all teams the key can access)."
},
"max_results": {
"type": "integer",
"maximum": 200,
"minimum": 1,
"description": "Entries per page, 1-200 (default 50)."
},
"message_contains": {
"type": "string",
"maxLength": 200,
"description": "Only entries whose message contains this text."
},
"continuation_token": {
"type": "string",
"maxLength": 4000,
"description": "The continuation_token of the previous page."
}
}
}List the alert categories of a team (name, color, keywords used to auto-classify alerts). The category name can be passed to signl4_raise_alert. GET /v3/categories/{teamId}.
| Argument | Type | Description |
|---|---|---|
| team_id* | string | SIGNL4 team id (a GUID); get it from signl4_list_teams. |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"team_id"
],
"properties": {
"team_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "SIGNL4 team id (a GUID); get it from signl4_list_teams."
}
}
}Planned on-call duty schedules (who is on duty when): start/end, team, user, tier, stand-in and shift info. Filter by team, user and time window. POST /v3/schedules (a read).
| Argument | Type | Description |
|---|---|---|
| to | string | End of the window, ISO 8601 with timezone. |
| from | string | Start of the window, ISO 8601 with timezone. |
| limit | integer | Maximum schedules to return, 1-500 (default 100). |
| user_id | string | Only this user's duties. |
| team_ids | array | Limit to these team ids (default: all teams the key can access). |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"to": {
"type": "string",
"description": "End of the window, ISO 8601 with timezone."
},
"from": {
"type": "string",
"description": "Start of the window, ISO 8601 with timezone."
},
"limit": {
"type": "integer",
"maximum": 500,
"minimum": 1,
"description": "Maximum schedules to return, 1-500 (default 100)."
},
"user_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "Only this user's duties."
},
"team_ids": {
"type": "array",
"items": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "SIGNL4 team id (a GUID); get it from signl4_list_teams."
},
"maxItems": 50,
"description": "Limit to these team ids (default: all teams the key can access)."
}
}
}List the users of the given teams (all accessible teams by default) with duty status. Teams that cannot be read are reported under `errors`. GET /v3/teams/users.
| Argument | Type | Description |
|---|---|---|
| team_ids | array | Limit to these team ids (default: all teams the key can access). |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"team_ids": {
"type": "array",
"items": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "SIGNL4 team id (a GUID); get it from signl4_list_teams."
},
"maxItems": 50,
"description": "Limit to these team ids (default: all teams the key can access)."
}
}
}List the SIGNL4 teams the API key can access: id, name, description, time zone and member ids. Team ids are needed to raise alerts and to look up categories and duties. GET /v3/teams.
| Argument | Type | Description |
|---|---|---|
| team_ids | array | Limit to these team ids (default: all teams the key can access). |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"team_ids": {
"type": "array",
"items": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "SIGNL4 team id (a GUID); get it from signl4_list_teams."
},
"maxItems": 50,
"description": "Limit to these team ids (default: all teams the key can access)."
}
}
}List the SIGNL4 users the key can access with name, e-mail, contact addresses, activation state and duty status per team (dutyMode, onDutyTime). User ids are needed to acknowledge/close/annotate alerts. GET /v3/users.
No arguments.
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {}
}WRITE: raise a new alert in a SIGNL4 team. THIS NOTIFIES REAL PEOPLE: every team member currently on duty is paged (push, SMS and/or voice call according to their settings) and the alert escalates if nobody acknowledges it. Only use it when the user clearly asked to alert the team; never for tests unless they said so. Not idempotent: a second call pages the team again. Returns the new alert incl. its id. POST /v3/signls.
| Argument | Type | Description |
|---|---|---|
| text* | string | Alert message body. |
| title* | string | Alert title, shown on the pager screen. |
| team_id* | string | SIGNL4 team id (a GUID); get it from signl4_list_teams. |
| category | string | Category name, see signl4_list_categories (default: automatic). |
| severity | string | Severity (default: SIGNL4's default for the team). |
| external_id | string | Your own reference for this alert, for later look-up (and for SIGNL4 to group follow-ups). |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"team_id",
"title",
"text"
],
"properties": {
"text": {
"type": "string",
"maxLength": 8000,
"minLength": 1,
"description": "Alert message body."
},
"title": {
"type": "string",
"maxLength": 500,
"minLength": 1,
"description": "Alert title, shown on the pager screen."
},
"team_id": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "SIGNL4 team id (a GUID); get it from signl4_list_teams."
},
"category": {
"type": "string",
"maxLength": 200,
"description": "Category name, see signl4_list_categories (default: automatic)."
},
"severity": {
"enum": [
"low",
"major",
"critical"
],
"type": "string",
"description": "Severity (default: SIGNL4's default for the team)."
},
"external_id": {
"type": "string",
"maxLength": 200,
"description": "Your own reference for this alert, for later look-up (and for SIGNL4 to group follow-ups)."
}
}
}| continuation_token | string | The continuation_token of the previous page. |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"text": {
"type": "string",
"maxLength": 200,
"description": "Free-text search in title and text."
},
"status": {
"enum": [
"open",
"acknowledged",
"closed"
],
"type": "string",
"description": "Only alerts in this state (default: all)."
},
"team_ids": {
"type": "array",
"items": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "SIGNL4 team id (a GUID); get it from signl4_list_teams."
},
"maxItems": 50,
"description": "Limit to these team ids (default: all teams the key can access)."
},
"external_id": {
"type": "string",
"maxLength": 200,
"description": "Only alerts raised with this external id."
},
"max_results": {
"type": "integer",
"maximum": 100,
"minimum": 1,
"description": "Alerts per page, 1-100 (default 25)."
},
"category_ids": {
"type": "array",
"items": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "A SIGNL4 id (a GUID)."
},
"maxItems": 50,
"description": "Only alerts of these category ids (see signl4_list_categories)."
},
"created_after": {
"type": "string",
"description": "ISO 8601 date-time with a timezone, e.g. 2026-10-01T00:00:00Z."
},
"created_before": {
"type": "string",
"description": "ISO 8601 date-time with a timezone, e.g. 2026-10-01T00:00:00Z."
},
"continuation_token": {
"type": "string",
"maxLength": 4000,
"description": "The continuation_token of the previous page."
}
}
}