The NATS consumer plugin reads from the specified NATS subjects and
creates metrics using one of the supported input data formats.
A Queue Group is used when subscribing to subjects so multiple
instances of telegraf can read from a NATS cluster in parallel.
Global configuration options
In addition to the plugin-specific configuration settings, plugins support
additional global and plugin configuration settings. These settings are used to
modify metrics, tags, and field or create aliases and configure ordering, etc.
See the CONFIGURATION.md for more details.
Configuration
# Read metrics from NATS subject(s)
[[inputs.nats_consumer]]
## urls of NATS servers
servers = ["nats://localhost:4222"]
## subject(s) to consume
## If you use jetstream you need to set the subjects
## in jetstream_subjects
subjects = ["telegraf"]
## jetstream subjects
## jetstream is a streaming technology inside of nats.
## With jetstream the nats-server persists messages and
## a consumer can consume historical messages. This is
## useful when telegraf needs to restart it don't miss a
## message. You need to configure the nats-server.
## https://docs.nats.io/nats-concepts/jetstream.
jetstream_subjects = ["js_telegraf"]
## name a queue group
queue_group = "telegraf_consumers"
## Optional credentials
# username = ""
# password = ""
## Optional NATS 2.0 and NATS NGS compatible user credentials
# credentials = "/etc/telegraf/nats.creds"
## Use Transport Layer Security
# secure = false
## Optional TLS Config
# tls_ca = "/etc/telegraf/ca.pem"
# tls_cert = "/etc/telegraf/cert.pem"
# tls_key = "/etc/telegraf/key.pem"
## Use TLS but skip chain & host verification
# insecure_skip_verify = false
## Sets the limits for pending msgs and bytes for each subscription
## These shouldn't need to be adjusted except in very high throughput scenarios
# pending_message_limit = 65536
# pending_bytes_limit = 67108864
## Maximum messages to read from the broker that have not been written by an
## output. For best throughput set based on the number of metrics within
## each message and the size of the output's metric_batch_size.
##
## For example, if each message from the queue contains 10 metrics and the
## output metric_batch_size is 1000, setting this to 100 will ensure that a
## full batch is collected and the write is triggered immediately without
## waiting until the next flush_interval.
# max_undelivered_messages = 1000
## Data format to consume.
## Each data format has its own unique set of configuration options, read
## more about them here:
## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
data_format = "influx"
Metrics
Which data you will get depends on the subjects you consume from nats
Example Output
Depends on the nats subject input
nats_consumer,host=[] value=1.9 1655972309339341000