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<#import "/templates/links.adoc" as links>

<@tmpl.guide
title="HTTP metrics"
summary="Learn about metrics for monitoring the {project_name} HTTP requests processing"
tileVisible="false"
includedOptions="http-metrics-histograms-enabled http-metrics-slos"
>

<#include "partials/prerequisites-metrics-troubleshooting.adoc" />

== Metrics

=== Processing time

The processing time is exposed by these metrics, to monitor the {project_name} performance and how long it takes to processing the requests.

TIP: On a healthy cluster, the average processing time will remain stable.
Spikes or increases in the processing time may be an early sign that some node is under load.

====
*Tags*

`method`:: HTTP method.
`outcome`:: A more general outcome tag.
`status`:: The HTTP status code.
`uri`:: The requested URI.
====

|===
|Metric |Description

m| http_server_requests_seconds_count
| The total number of requests processed.

m| http_server_requests_seconds_sum
| The total duration for all the requests processed.
|===

You can enable histograms for this metric by setting `http-metrics-histograms-enabled` to `true`, and add additional buckets for service level objectives using the option `http-metrics-slos`.

include::partials/histogram_note_http.adoc[]

=== Active requests

The current number of active requests is also available.

|===
|Metric |Description

m| http_server_active_requests
| The current number of active requests

|===

=== Bandwidth

The metrics below helps to monitor the bandwidth and consumed traffic used by {project_name} and consumed by the requests and responses received or sent.

|===
|Metric |Description

m| http_server_bytes_written_count
| The total number of responses sent.

m| http_server_bytes_written_sum
| The total number of bytes sent.

m| http_server_bytes_read_count
| The total number of requests received.

m| http_server_bytes_read_sum
| The total number of bytes received.

|===

include::partials/histogram_note_http.adoc[]


== Next steps

Return back to the <@links.observability id="metrics-for-troubleshooting"/> or,

* For single site deployments proceed to <@links.observability id="metrics-for-troubleshooting-clustering-and-network"/>,
* and for multiple sites deployments proceed to <@links.observability id="metrics-for-troubleshooting-embedded-caches-multi-site"/>

</@tmpl.guide>
