Documentation forAppOptics



HAProxy is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications.

This plugin is currently available for x86_64 Linux and Windows platforms.


The haproxy plugin is included with the SolarWinds Snap Agent by default, please follow the directions below to enable it for a agent instance.


This plugin requires that HAProxy is running and its stats endpoint API is available from the host where the plugin runs. The integration supports connecting via local/remote URI or unix socket.

This plugin fully supports HAProxy in versions from 1.4 up to 1.9

You might want to customize the relevant values in haproxy configuration file:

  stats socket /run/haproxy/haproxy.sock mode 660 level admin


listen stats
  bind # default

  stats enable
  stats auth admin:admin
  stats realm HAProxy\ Statistics
  stats show-node
  stats uri /haproxy?stats # default



The agent provides an example configuration file to help you get started quickly. It defines the plugin and task file to be loaded by the agent, but requires you to provide the correct settings for your HAProxy server. To enable the plugin:

  1. Make a copy of the haproxy example configuration file:

    sudo cp -p /opt/SolarWinds/Snap/etc/plugins.d/haproxy.yaml.example /opt/SolarWinds/Snap/etc/plugins.d/haproxy.yaml
  2. Update /opt/SolarWinds/Snap/etc/plugins.d/haproxy.yaml configuration file with settings specific to your HAProxy server for example:

          ## Endpoint URI (required)
          ## Setting should correspond to values set in 'listen stats' section in haproxy.cfg at 'bind', 'mode' and 'stats uri'
          ## should begin with http:// or https://
          endpoint: ";csv"
          ## ... or with unix:// for socket-based connection, as set in haproxy.cfg at 'stats socket'
          # endpoint: "unix:///run/haproxy/haproxy.sock"
          ## Can optionally include auth credentials
          ## Setting should correspond to value set in haproxy.cfg at 'stats auth' (if any), eg:
          # endpoint: "http://username:password@;csv"
          ## Can also be a list of endpoints using embedded multiline YAML string syntax:
          # endpoint: |
          #   list:
          #     - endpoint:;csv
          #       username: username
          #       password: password
          #       timeout: 15s
          ## Or in a simpler yet deprecated format:
          # endpoint: |
          #   unix:///run/haproxy/haproxy.sock
          ## Timeout for connecting to HAProxy API
          ## Defaults to 5s
          # timeout: "5s"
      plugin: snap-plugin-collector-aohaproxy
      task: task-aohaproxy.yaml

    The setting endpoint (required): should be set to the valid HAProxy API server IP or FQDN or unix socket path. Can be a single endpoint or a yaml multiline string with many endpoints (newline-delimited). For multiline YAML, a yaml-in-yaml syntax with embedded key-value settings is also supported (since version 9 of the plugin).

    The setting timeout (optional, defaults to 5s): it is a timeout for connecting to HAProxy stats endpoint.

  3. Restart the agent:

    sudo service swisnapd restart
  4. Enable the HAProxy plugin in the AppOptics UI

    On the Integrations Page you will see the HAProxy plugin available if the previous steps were successful. If you do not see the plugin, see Troubleshooting Linux.

    Select the HAProxy plugin to open the configuration menu in the UI, and enable the plugin.

    You should soon see the haproxy metrics reported to your dashboard.

Metrics and Tags

The table below lists each of the metrics gathered from the status endpoint.

Default Metric Tags

All HAProxy metrics are tagged with hostname. Instead of using this tag we recommend using the @host alias. Additionally, every metric is tagged with endpoint, pxname and svname.

Metrics status, check_status, agent_status and mode are additionally tagged with their original textual values.

All Metrics

All metrics keep their original names as returned from HAProxy stats and are extensively described in the official HAProxy CSV stats docs <>.

Every metric can be requested in the following form: /haproxy/<endpoint>/<pxname>/<svname>/<metric_name> with the values in brackets given explicitly or using a wildcard (*). For endpoint(s), any valid substring of the requested endpoint(s) would work.

Only numeric metrics are available with the exception of status, check_status, agent_status and mode which are mapped to sequential integer values and come with their original textual values as additional tags.

All available metrics list are listed below. Type values in are literally adapted from the official docs and state which type may have a value for given field. The types are L (Listeners), F (Frontends), B (Backends), and S (Servers).

CSV index Types Namespace Description
2 _ _ B S haproxy.qcur current queued requests. For the backend this reports the number queued without a server assigned.
3 _ _ B S haproxy.qmax max value of qcur
4 L F B S haproxy.scur current sessions
5 L F B S haproxy.smax max sessions
6 L F B S haproxy.slim configured session limit
7 L F B S haproxy.stot cumulative number of sessions
8 L F B S haproxy.bin bytes in
9 L F B S haproxy.bout bytes out
10 L F B _ haproxy.dreq requests denied because of security concerns.
11 L F B S haproxy.dresp responses denied because of security concerns.
12 L F _ _ haproxy.ereq request errors.
13 _ _ B S haproxy.econ number of requests that encountered an error trying to connect to a backend server.
14 _ _ B S haproxy.eresp response errors. srv_abrt will be counted here also.
15 _ _ B S haproxy.wretr number of times a connection to a server was retried.
16 _ _ B S haproxy.wredis number of times a request was redispatched to another server. The server value counts the number of times that server was switched away from.
17 L F B S haproxy.status status (UP/DOWN/NOLB/MAINT/MAINT(via)/MAINT(resolution)…)
18 _ _ B S haproxy.weight total weight (backend), server weight (server)
19 _ _ B S haproxy.act number of active servers (backend), server is active (server)
20 _ _ B S haproxy.bck number of backup servers (backend), server is backup (server)
21 _ _ _ S haproxy.chkfail number of failed checks. (Only counts checks failed when the server is up.)
22 _ _ B S haproxy.chkdown number of UP->DOWN transitions. The backend counter counts transitions to the whole backend being down, rather than the sum of the counters for each server.
23 _ _ B S haproxy.lastchg number of seconds since the last UP<->DOWN transition
24 _ _ B S haproxy.downtime total downtime (in seconds). The value for the backend is the downtime for the whole backend, not the sum of the server downtime.
25 _ _ _ S haproxy.qlimit configured maxqueue for the server, or nothing in the value is 0 (default, meaning no limit)
26 L F B S process id (0 for first instance, 1 for second, …)
27 L F B S haproxy.iid unique proxy id
28 L _ _ S haproxy.sid server id (unique inside a proxy)
29 _ _ _ S haproxy.throttle current throttle percentage for the server, when slowstart is active, or no value if not in slowstart.
30 _ _ B S haproxy.lbtot total number of times a server was selected, either for new sessions, or when re-dispatching
31 _ _ _ S haproxy.tracked id of proxy/server if tracking is enabled.
32 L F B S haproxy.type (0=frontend, 1=backend, 2=server, 3=socket/listener)
33 _ F B S haproxy.rate number of sessions per second over last elapsed second
34 _ F _ _ haproxy.rate_lim configured limit on new sessions per second
35 _ F B S haproxy.rate_max max number of new sessions per second
36 _ _ _ S haproxy.check_status status of last health check
37 _ _ _ S haproxy.check_code layer 5 - 7 code, if available
38 _ _ _ S haproxy.check_duration time in ms took to finish last health check
39 _ F B S haproxy.hrsp_1xx http responses with 1xx code
40 _ F B S haproxy.hrsp_2xx http responses with 2xx code
41 _ F B S haproxy.hrsp_3xx http responses with 3xx code
42 _ F B S haproxy.hrsp_4xx http responses with 4xx code
43 _ F B S haproxy.hrsp_5xx http responses with 5xx code
44 _ F B S haproxy.hrsp_other http responses with other codes (protocol error)
46 _ F _ _ haproxy.req_rate HTTP requests per second over last elapsed second
47 _ F _ _ haproxy.req_rate_max max number of HTTP requests per second observed
48 _ F B _ haproxy.req_tot total number of HTTP requests received
49 _ _ B S haproxy.cli_abrt number of data transfers aborted by the client
50 _ _ B S haproxy.srv_abrt number of data transfers aborted by the server (inc. in eresp)
51 _ F B _ haproxy.comp_in number of HTTP response bytes fed to the compressor
52 _ F B _ haproxy.comp_out number of HTTP response bytes emitted by the compressor
53 _ F B _ haproxy.comp_byp number of bytes that bypassed the HTTP compressor (CPU/BW limit)
54 _ F B _ haproxy.comp_rsp number of HTTP responses that were compressed
55 _ _ B S haproxy.lastsess number of seconds since last session assigned to server/backend
58 _ _ B S haproxy.qtime the average queue time in ms over the 1024 last requests
59 _ _ B S haproxy.ctime the average connect time in ms over the 1024 last requests
60 _ _ B S haproxy.rtime the average response time in ms over the 1024 last requests (0 for TCP)
61 _ _ B S haproxy.ttime the average total session time in ms over the 1024 last requests
62 _ _ _ S haproxy.agent_status status of last agent check.
63 _ _ _ S haproxy.agent_code numeric code reported by agent if any (unused for now)
64 _ _ _ S haproxy.agent_duration time in ms taken to finish last check
67 _ _ _ S haproxy.check_rise server's ‘rise' parameter used by checks
68 _ _ _ S haproxy.check_fall server's ‘fall' parameter used by checks
69 _ _ _ S haproxy.check_health server's health check value between 0 and rise+fall-1
70 _ _ _ S haproxy.agent_rise agent's ‘rise' parameter, normally 1
71 _ _ _ S haproxy.agent_fall agent's ‘fall' parameter, normally 1
72 _ _ _ S haproxy.agent_health agent's health parameter, between 0 and rise+fall-1
75 L F B S haproxy.mode proxy mode (tcp, http, health, unknown)
77 _ F _ _ haproxy.conn_rate number of connections over the last elapsed second
78 _ F _ _ haproxy.conn_rate_max highest known conn_rate
79 _ F _ _ haproxy.conn_tot cumulative number of connections
80 _ F B _ haproxy.intercepted cum. number of intercepted requests (monitor, stats)
81 L F _ _ haproxy.dcon requests denied by ‘tcp-request connection' rules
82 L F _ _ haproxy.dses requests denied by ‘tcp-request session' rules
83 L F B S haproxy.wrew cumulative number of failed header rewriting warnings

Navigation Notice: When the APM Integrated Experience is enabled, AppOptics shares a common navigation and enhanced feature set with other integrated experience products. How you navigate AppOptics and access its features may vary from these instructions.

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