---
title: InfluxDB system buckets
description: >
  InfluxDB system buckets contain time series data used by and generated from the
  InfluxDB monitoring and alerting system and the task engine.
menu:
  influxdb_v2:
    name: System buckets
    parent: InfluxDB internals
weight: 103
influxdb/v2/tags: [buckets]
related:
  - /influxdb/v2/monitor-alert/
  - /influxdb/v2/process-data/
  - /flux/v0/stdlib/influxdata/influxdb/monitor/check/
  - /flux/v0/stdlib/influxdata/influxdb/monitor/deadman/
  - /flux/v0/stdlib/influxdata/influxdb/monitor/from/
  - /flux/v0/stdlib/influxdata/influxdb/monitor/logs/
  - /flux/v0/stdlib/influxdata/influxdb/monitor/notify/
---

InfluxDB system buckets contain time series data used by and generated from the
InfluxDB monitoring and alerting system and the task engine.

Each InfluxDB organization includes the following system buckets:

- [\_monitoring](#_monitoring-system-bucket)
- [\_tasks](#_tasks-system-bucket)

{{% note %}}
The system bucket schemas below reference **InfluxDB data elements**.
For more information, see [InfluxDB key concepts](/influxdb/v2/reference/key-concepts/data-elements/).
{{% /note %}}

## \_monitoring system bucket
The `_monitoring` system bucket stores InfluxDB data used to
[monitor data and send alerts](/influxdb/v2/monitor-alert/).

**Data retention:** 7 days

### \_monitoring bucket schema

- **statuses** _(measurement)_
    - **tags:**
        - **\_check\_id:** check ID
        - **\_check\_name:** check name
        - **\_level:** level evaluated by the check (ok, info, warn, or crit)
        - **\_source\_measurement:** original measurement queried by the check
        - **\_type:** check type (threshold or deadman)
        - _other tags inherited from queried data or added in the check configuration_
    - **fields:**
        - **\_message:** message generated by the check
        - **\_source_timestamp:** original timestamp of the queried data
        - _other fields inherited from queried data_
- **notifications** _(measurement)_
    - **tags:**
        - **\_check\_id:** check ID that triggered the notification
        - **\_check\_name:** check name that triggered the notification
        - **\_level:** check-evaluated level that triggered the notification (ok, info, warn, or crit)
        - **\_notification_endpoint_id:** notification endpoint ID
        - **\_notification_endpoint_name:** notification endpoint name
        - **\_notification_rule_id:** notification rule ID
        - **\_notification_rule_name:** notification rule name
        - **\_sent:** sent status (true or false)
        - **\_source\_measurement:** original measurement queried by the check
        - **\_type:** check type (threshold or deadman)
        - _other tags inherited from queried data or added in the check configuration_
    - **fields:**
        - **\_message:** message generated by the check
        - **\_source_timestamp:** original timestamp of the queried data
        - **\_status_timestamp:** timestamp when the status (`_level`) was evaluated
        - _other fields inherited from queried data_
- {{% cloud-only %}}

  **rejected_points** _(measurement)_
  
  - **tags:**
    - **bucket:** ID of the bucket targeted in the write request
    - **reason:** brief description of why InfluxDB rejected the point
    - **field:** field name of the point (present if the point contained a field)
    - **measurement:** measurement of the point (present if the point contained a measurement)
    - **gotType:** InfluxDB field type in the point (present if type mismatch)
    - **wantType:** InfluxDB field type in the bucket schema (present if type mismatch)
  - **fields:**
    - **_field:** `count` (for data type and schema conflicts) or `error` (for parsing errors)
    - **_value:** `1` if `_field: "count"` or error details if `_field: "error"`
    - **timestamp:** time the rejected point was logged
  {{% /cloud-only %}}


## \_tasks system bucket
The `_tasks` system bucket stores data related to [InfluxDB task](/influxdb/v2/process-data/) executions.

**Data retention:** 3 days

### \_tasks bucket schema

_A **task run** refers to a single task execution._

- **runs** _(measurement)_
    - **tags:**
        - **status:** task run status (success or failed)
        - **taskID:** task ID
    - **fields:**
        - **finishedAt:** timestamp when the task run finished
        - **logs:** log output from the task run
        - **requestedAt:** timestamp when the task run was requested
        - **runID** task run ID
        - **scheduledFor:** timestamp the task run was scheduled for
        - **startedAt:** timestamp when the task run started