StatsD - Plugin | Kong Docs

Looking for the plugin's configuration parameters? You can find them in the StatsD configuration reference doc.

Log metrics for a service or route to a StatsD server. It can also be used to log metrics on Collectd daemon by enabling its StatsD plugin.

By default, the plugin sends a packet for each metric it observes. The udp_packet_size option configures the greatest datagram size the plugin can combine. It should be less than 65507 according to UDP protocol. Consider the MTU of the network when setting this parameter.

Queueing

The StatsD plugin uses a queue to decouple the production and consumption of data. This reduces the number of concurrent requests made to the upstream server under high load situations and provides buffering during temporary network or upstream outages.

You can set several parameters to configure the behavior and capacity of the queues used by the plugin. For more information about how to use these parameters, see Plugin Queuing Reference in the Kong Gateway documentation.

The queue parameters all reside in a record under the key queue in the config parameter section of the plugin.

Queues are not shared between workers and queueing parameters are scoped to one worker. For whole-system capacity planning, the number of workers need to be considered when setting queue parameters.

Metrics

Metric	Description	Namespace syntax
`request_count`	The number of requests.	`kong.service.<service_identifier>.request.count`
`request_size`	The request’s body size in bytes.	`kong.service.<service_identifier>.request.size`
`response_size`	The response’s body size in bytes.	`kong.service.<service_identifier>.response.size`
`latency`	The time interval in milliseconds between the request and response.	`kong.service.<service_identifier>.latency`
`status_count`	Tracks each status code returned in a response.	`kong.service.<service_identifier>.status.<status>`
`unique_users`	Tracks unique users who made requests to the underlying Service or route.	`kong.service.<service_identifier>.user.uniques`
`request_per_user`	Tracks the request count per consumer.	`kong.service.<service_identifier>.user.<consumer_identifier>.request.count`
`upstream_latency`	Tracks the time in milliseconds it took for the final Service to process the request.	`kong.service.<service_identifier>.upstream_latency`
`kong_latency`	Tracks the internal Kong latency in milliseconds that it took to run all the plugins.	`kong.service.<service_identifier>.kong_latency`
`status_count_per_user`	Tracks the status code per consumer per service.	`kong.service.<service_identifier>.user.<consumer_identifier>.status.<status>`
`status_count_per_workspace`	The status code per workspace.	`kong.service.<service_identifier>.workspace.<workspace_identifier>.status.<status>`
`status_count_per_user_per_route`	The status code per consumer per route.	`kong.route.<route_id>.user.<consumer_identifier>.status.<status>`
`shdict_usage`	The usage of a shared dict, sent once every minute. Monitors any `lua_shared_dict` used by Kong Gateway. You can find all the shared dicts Kong Gateway has configured using the `/status` endpoint of the Admin API. For example, the metric might report on `shdict.kong_locks` or `shdict.kong_counters`.	`kong.node.<node_hostname>.shdict.<lua_shared_dict>.free_space` and `kong.node.<node_hostname>.shdict.<lua_shared_dict>.capacity`
`cache_datastore_hits_total`	The total number of cache hits. (Kong Gateway Enterprise only)	`kong.service.<service_identifier>.cache_datastore_hits_total`
`cache_datastore_misses_total`	The total number of cache misses. (Kong Gateway Enterprise only)	`kong.service.<service_identifier>.cache_datastore_misses_total`

If a request URI doesn’t match any Routes, the following metrics are sent instead:

Metric	Description	Namespace
`request_count`	The request count.	`kong.global.unmatched.request.count`
`request_size`	The request’s body size in bytes.	`kong.global.unmatched.request.size`
`response_size`	The response’s body size in bytes.	`kong.global.unmatched.response.size`
`latency`	The time interval between when the request started and when the response is received from the upstream server.	`kong.global.unmatched.latency`
`status_count`	The status count.	`kong.global.unmatched.status.<status>.count`
`kong_latency`	The internal Kong latency in milliseconds that it took to run all the plugins.	`kong.global.unmatched.kong_latency`

If you enable the tag_style configuration for the StatsD plugin, the following metrics are sent instead:

Metric	Description	Namespace
`request_count`	The number of requests.	`kong.request.count`
`request_size`	The request’s body size in bytes.	`kong.request.size`
`response_size`	The response’s body size in bytes.	`kong.response.size`
`latency`	The time interval in milliseconds between the request and response.	`kong.latency`
`request_per_user`	Tracks the request count per consumer.	`kong.request.count`
`upstream_latency`	Tracks the time in milliseconds it took for the final service to process the request.	`kong.upstream_latency`
`shdict_usage`	The usage of shared dict, sent once every minute.	`kong.shdict.free_space` and `kong.shdict.capacity`
`cache_datastore_hits_total`	The total number of cache hits. (Kong Gateway Enterprise only)	`kong.cache_datastore_hits_total`
`cache_datastore_misses_total`	The total number of cache misses. (Kong Gateway Enterprise only)	`kong.cache_datastore_misses_total`

The StatsD plugin supports Librato, InfluxDB, DogStatsD, and SignalFX-style tags, which are used like Prometheus labels.

Librato-style tags: Must be appended to the metric name with a delimiting #, for example: metric.name#tagName=val,tag2Name=val2:0|c See the Librato StatsD documentation for more information.
InfluxDB-style tags: Must be appended to the metric name with a delimiting comma, for example: metric.name,tagName=val,tag2Name=val2:0|c See the InfluxDB StatsD documentation for more information.
DogStatsD-style tags: Appended as a |# delimited section at the end of the metric, for example: metric.name:0|c|#tagName:val,tag2Name:val2 See the Datadog StatsD Tags documentation for more information about the concept description and Datagram Format. AWS CloudWatch also uses the DogStatsD protocol.
SignalFX dimension: Add the tags to the metric name in square brackets, for example: metric.name[tagName=val,tag2Name=val2]:0|c See the SignalFX StatsD documentation for more information.

When the tag_style config is enabled, Kong Gateway uses a filter label, like service, route, workspace, consumer, node, or status, on the metrics tags to see if these can be found. For shdict_usage metrics, only node and shdict are added.

For example:

kong.request.size,workspace=default,route=d02485d7-8a28-4ec2-bc0b-caabed82b499,status=200,consumer=d24d866a-020a-4605-bc3c-124f8e1d5e3f,service=bdabce05-e936-4673-8651-29d2e9eca382,node=c80a9c5845bd:120|c

Metric Fields

The plugin can be configured with any combination of Metrics, with each entry containing the following fields:

Field	Description	Datatype	Allowed values
`name` required	StatsD metric’s name.	String	Metrics
`stat_type` required	Determines what sort of event a metric represents.	String	`gauge`, `timer`, `counter`, `histogram`, `meter` and `set`
`sample_rate` required conditional	Sampling rate.	Number	`number`
`consumer_identifier` conditional	Authenticated user detail.	String	One of the following options: `consumer_id`, `custom_id`, `username`, `null`

`service_identifier` conditional	Service detail.	String	One of the following options: `service_id`, `service_name`, `service_host`, `service_name_or_host`, `null`
`workspace_identifier` conditional	Workspace detail.	String	One of the following options:`workspace_id`, `workspace_name`, `null`

Metric behaviors

By default, all metrics get logged.
Metric with stat_type set to counter or gauge must have sample_rate defined as well.
unique_users metric only works with stat_type as set.
status_count, status_count_per_user, status_count_per_user_per_route and request_per_user work only with stat_type as counter.
shdict_usage work only with stat_type as gauge.
status_count_per_user, request_per_user, unique_users and status_count_per_user_per_route must have customer_identifier defined.
All metrics can optionally configure service_identifier; by default it’s set to service_name_or_host.
status_count_per_workspace must have workspace_identifier defined.

Kong Process Errors

This logging plugin logs HTTP request and response data, and also supports stream data (TCP, TLS, and UDP).

The Kong process error file is the Nginx error file. You can find it at the following path:

{prefix}/logs/error.log

Configure the prefix in kong.conf.

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