monitor.deadman() function
The monitor.deadman()
function detects when a group stops reporting data.
It takes a stream of tables and reports if groups have been observed since time t
.
import "influxdata/influxdb/monitor"
monitor.deadman(t: 2019-08-30T12:30:00Z)
monitor.deadman()
retains the most recent row from each input table and adds a dead
column.
If a record appears after time t
, monitor.deadman()
sets dead
to false
.
Otherwise, dead
is set to true
.
Parameters
t
The time threshold for the deadman check.
tables
Input data.
Default is piped-forward data (<-
).
Examples
Detect if a host hasn’t reported in the last five minutes
import "influxdata/influxdb/monitor"
import "experimental"
from(bucket: "example-bucket")
|> range(start: -10m)
|> group(columns: ["host"])
|> monitor.deadman(t: experimental.subDuration(d: 5m, from: now()))
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