---
title: tickscript.deadman() function
description: tickscript.deadman() detects low data throughput and writes a point with a critical status to the InfluxDB _monitoring system bucket.
url: https://docs.influxdata.com/flux/v0/stdlib/contrib/bonitoo-io/tickscript/deadman/
estimated_tokens: 3265
product: Flux
version: v0
---

# tickscript.deadman() function

-   Flux 0.111.0+
-   View InfluxDB support

`tickscript.deadman()` is a user-contributed function maintained by the [package author](#package-author-and-maintainer).

`tickscript.deadman()` detects low data throughput and writes a point with a critical status to the InfluxDB `_monitoring` system bucket.

For each input table containing a number of rows less than or equal to the specified threshold, the function assigns a `crit` value to the `_level` column.

This function is comparable to [Kapacitor AlertNode deadman](/kapacitor/latest/nodes/stream_node/#deadman).

##### Function type signature

```js
(
    <-tables: stream[M],
    check: {A with tags: E, _type: D, _check_name: C, _check_id: B},
    measurement: string,
    ?id: (r: {F with _check_name: C, _check_id: B}) => G,
    ?message: (
        r: {
            H with
            dead: bool,
            _type: D,
            _time: J,
            _time: time,
            _source_timestamp: int,
            _source_measurement: I,
            _measurement: I,
            _measurement: string,
            _level: string,
            _check_name: C,
            _check_id: B,
        },
    ) => K,
    ?threshold: L,
    ?topic: string,
) => stream[{
    H with
    dead: bool,
    _type: D,
    _time: J,
    _time: time,
    _source_timestamp: int,
    _source_measurement: I,
    _message: K,
    _measurement: I,
    _measurement: string,
    _level: string,
    _check_name: C,
    _check_id: B,
}] where E: Record, F: Record, L: Comparable + Equatable, M: Record
```

For more information, see [Function type signatures](/flux/v0/function-type-signatures/).

## Parameters

### check

(Required) InfluxDB check data. See `tickscript.defineCheck()`.

### measurement

(Required) Measurement name. Should match the queried measurement.

### threshold

Count threshold. Default is `0`.

The function assigns a `crit` status to input tables with a number of rows less than or equal to the threshold.

### id

Function that returns the InfluxDB check ID provided by the check record. Default is `(r) => "${r._check_id}"`.

### message

Function that returns the InfluxDB check message using data from input rows. Default is `(r) => "Deadman Check: ${r._check_name} is: " + (if r.dead then "dead" else "alive")`.

### topic

Check topic. Default is `""`.

### tables

Input data. Default is piped-forward data (`<-`).

## Examples

### Detect when a series stops reporting

```js
import "contrib/bonitoo-io/tickscript"

option task = {name: "Example task", every: 1m}

from(bucket: "example-bucket")
    |> range(start: -task.every)
    |> filter(fn: (r) => r._measurement == "pulse" and r._field == "value")
    |> tickscript.deadman(
        check: tickscript.defineCheck(id: "000000000000", name: "task/${r.service}"),
        measurement: "pulse",
        threshold: 2,
    )
```

#### Related

-   [Kapacitor BatchNode – Deadman](/kapacitor/v1/nodes/batch_node/#deadman)

[transformations](/flux/v0/tags/transformations/)