GET alerts

Fields to include with the response. Multiple fields **MUST** be a comma-separated (U+002C COMMA, ",") list. Note that fields can also be selected for included data types: see the [V3 API Best Practices](https://www.mbta.com/developers/v3-api/best-practices) for an example.

Filter to alerts for only those activities (`/data/{index}/attributes/informed_entity/activities/{activity_index}`) matching. Multiple activities **MUST** be a comma-separated (U+002C COMMA, ",") list. An activity affected by an alert. | Value | Description ...

When combined with other filters, filters by alerts with or without a banner. **MUST** be "true" or "false".

Filter to alerts that are active at a given time (ISO8601 format). Additionally, the string "NOW" can be used to filter to alerts that are currently active.

Filter by direction of travel along the route. Must be used in conjuction with `filter[route]` to apply. The meaning of `direction_id` varies based on the route. You can programmatically get the direction names from `/routes` `/data/{index}/attributes/direction_names` or `/routes/{id}` `/data/attri...

Constraints: {'enum': ['0', '1']}

Filter by `/data/{index}/relationships/facility/data/id`. Multiple IDs **MUST** be a comma-separated (U+002C COMMA, ",") list.

Filter by multiple IDs. Multiple IDs **MUST** be a comma-separated (U+002C COMMA, ",") list.

Filters by an alert's lifecycle. **MUST** be a comma-separated (U+002C COMMA, ",") list.

Filter by `/data/{index}/relationships/route/data/id`. Multiple IDs **MUST** be a comma-separated (U+002C COMMA, ",") list.

Filter by route_type: https://gtfs.org/documentation/schedule/reference/#routestxt. Multiple `route_type` **MUST** be a comma-separated (U+002C COMMA, ",") list.

Constraints: {'enum': ['0', '1', '2', '3', '4']}

Filters alerts by list of severities. **MUST** be a comma-separated (U+002C COMMA, ",") list. Example: filter[severity]=3,4,10 returns alerts with severity levels 3, 4 and 10.

Filter by `/data/{index}/relationships/stop/data/id`. Multiple IDs **MUST** be a comma-separated (U+002C COMMA, ",") list. Parent station IDs are treated as though their child stops were also included.

Filter by `/data/{index}/relationships/trip/data/id`. Multiple IDs **MUST** be a comma-separated (U+002C COMMA, ",") list.

Relationships to include. * `stops` * `routes` * `trips` * `facilities` The value of the include parameter **MUST** be a comma-separated (U+002C COMMA, ",") list of relationship paths. A relationship path is a dot-separated (U+002E FULL-STOP, ".") list of relationship names. [JSONAPI "include" beh...

Max number of elements to return

Offset (0-based) of first element in the page

Results can be [sorted](http://jsonapi.org/format/#fetching-sorting) by the id or any `/data/{index}/attributes` key. Assumes ascending; may be prefixed with '-' for descending | JSON pointer | Direction | `sort` | |--------------|-----------|------------| | `/data/{index}/attributes/active_per...

Constraints: {'enum': ['active_period', '-active_period', 'banner', '-banner', 'cause', '-cause', 'closed_timestamp', '-closed_timestamp', 'created_at', '-created_at', 'description', '-description', 'duration_certainty', '-duration_certainty', 'effect', '-effect', 'effect_name', '-effect_name', 'header', '-header', 'image', '-image', 'image_alternative_text', '-image_alternative_text', 'informed_entity', '-informed_entity', 'last_push_notification_timestamp', '-last_push_notification_timestamp', 'lifecycle', '-lifecycle', 'reminder_times', '-reminder_times', 'service_effect', '-service_effect', 'severity', '-severity', 'short_header', '-short_header', 'timeframe', '-timeframe', 'updated_at', '-updated_at', 'url', '-url']}