src/go/plugin/go.d/modules/vernemq/integrations/vernemq.md
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# VerneMQ
<img src="https://netdata.cloud/img/vernemq.svg" width="150"/>
Plugin: go.d.plugin
Module: vernemq
<img src="https://img.shields.io/badge/maintained%20by-Netdata-%2300ab44" />
## Overview
This collector monitors VerneMQ instances.
This collector is supported on all platforms.
This collector supports collecting metrics from multiple instances of this integration, including remote instances.
### Default Behavior
#### Auto-Detection
This integration doesn't support auto-detection.
#### Limits
The default configuration for this integration does not impose any limits on data collection.
#### Performance Impact
The default configuration for this integration is not expected to impose a significant performance impact on the system.
## Metrics
Metrics grouped by *scope*.
The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.
### Per VerneMQ instance
These metrics refer to the entire monitored application.
This scope has no labels.
Metrics:
| Metric | Dimensions | Unit |
|:------|:----------|:----|
| vernemq.sockets | open | sockets |
| vernemq.socket_operations | open, close | sockets/s |
| vernemq.client_keepalive_expired | closed | sockets/s |
| vernemq.socket_close_timeout | closed | sockets/s |
| vernemq.socket_errors | errors | errors/s |
| vernemq.queue_processes | queue_processes | queue processes |
| vernemq.queue_processes_operations | setup, teardown | events/s |
| vernemq.queue_process_init_from_storage | queue_processes | queue processes/s |
| vernemq.queue_messages | received, sent | messages/s |
| vernemq.queue_undelivered_messages | dropped, expired, unhandled | messages/s |
| vernemq.router_subscriptions | subscriptions | subscriptions |
| vernemq.router_matched_subscriptions | local, remote | subscriptions/s |
| vernemq.router_memory | used | KiB |
| vernemq.average_scheduler_utilization | utilization | percentage |
| vernemq.system_utilization_scheduler | a dimension per scheduler | percentage |
| vernemq.system_processes | processes | processes |
| vernemq.system_reductions | reductions | ops/s |
| vernemq.system_context_switches | context_switches | ops/s |
| vernemq.system_io | received, sent | kilobits/s |
| vernemq.system_run_queue | ready | processes |
| vernemq.system_gc_count | gc | ops/s |
| vernemq.system_gc_words_reclaimed | words_reclaimed | ops/s |
| vernemq.system_allocated_memory | processes, system | KiB |
| vernemq.bandwidth | received, sent | kilobits/s |
| vernemq.retain_messages | messages | messages |
| vernemq.retain_memory | used | KiB |
| vernemq.cluster_bandwidth | received, sent | kilobits/s |
| vernemq.cluster_dropped | dropped | kilobits/s |
| vernemq.netsplit_unresolved | unresolved | netsplits |
| vernemq.netsplits | resolved, detected | netsplits/s |
| vernemq.mqtt_auth | received, sent | packets/s |
| vernemq.mqtt_auth_received_reason | a dimensions per reason | packets/s |
| vernemq.mqtt_auth_sent_reason | a dimensions per reason | packets/s |
| vernemq.mqtt_connect | connect, connack | packets/s |
| vernemq.mqtt_connack_sent_reason | a dimensions per reason | packets/s |
| vernemq.mqtt_disconnect | received, sent | packets/s |
| vernemq.mqtt_disconnect_received_reason | a dimensions per reason | packets/s |
| vernemq.mqtt_disconnect_sent_reason | a dimensions per reason | packets/s |
| vernemq.mqtt_subscribe | subscribe, suback | packets/s |
| vernemq.mqtt_subscribe_error | failed | ops/s |
| vernemq.mqtt_subscribe_auth_error | unauth | attempts/s |
| vernemq.mqtt_unsubscribe | unsubscribe, unsuback | packets/s |
| vernemq.mqtt_unsubscribe_error | mqtt_unsubscribe_error | ops/s |
| vernemq.mqtt_publish | received, sent | packets/s |
| vernemq.mqtt_publish_errors | failed | ops/s |
| vernemq.mqtt_publish_auth_errors | unauth | attempts/s |
| vernemq.mqtt_puback | received, sent | packets/s |
| vernemq.mqtt_puback_received_reason | a dimensions per reason | packets/s |
| vernemq.mqtt_puback_sent_reason | a dimensions per reason | packets/s |
| vernemq.mqtt_puback_invalid_error | unexpected | messages/s |
| vernemq.mqtt_pubrec | received, sent | packets/s |
| vernemq.mqtt_pubrec_received_reason | a dimensions per reason | packets/s |
| vernemq.mqtt_pubrec_sent_reason | a dimensions per reason | packets/s |
| vernemq.mqtt_pubrec_invalid_error | unexpected | messages/s |
| vernemq.mqtt_pubrel | received, sent | packets/s |
| vernemq.mqtt_pubrel_received_reason | a dimensions per reason | packets/s |
| vernemq.mqtt_pubrel_sent_reason | a dimensions per reason | packets/s |
| vernemq.mqtt_pubcom | received, sent | packets/s |
| vernemq.mqtt_pubcomp_received_reason | a dimensions per reason | packets/s |
| vernemq.mqtt_pubcomp_sent_reason | a dimensions per reason | packets/s |
| vernemq.mqtt_pubcomp_invalid_error | unexpected | messages/s |
| vernemq.mqtt_ping | pingreq, pingresp | packets/s |
| vernemq.node_uptime | time | seconds |
## Alerts
The following alerts are available:
| Alert name | On metric | Description |
|:------------|:----------|:------------|
| [ vernemq_socket_errors ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.socket_errors | number of socket errors in the last minute |
| [ vernemq_queue_message_drop ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.queue_undelivered_messages | number of dropped messaged due to full queues in the last minute |
| [ vernemq_queue_message_expired ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.queue_undelivered_messages | number of messages which expired before delivery in the last minute |
| [ vernemq_queue_message_unhandled ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.queue_undelivered_messages | number of unhandled messages (connections with clean session=true) in the last minute |
| [ vernemq_average_scheduler_utilization ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.average_scheduler_utilization | average scheduler utilization over the last 10 minutes |
| [ vernemq_cluster_dropped ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.cluster_dropped | amount of traffic dropped during communication with the cluster nodes in the last minute |
| [ vernemq_netsplits ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vvernemq.netsplits | number of detected netsplits (split brain situation) in the last minute |
| [ vernemq_mqtt_connack_sent_reason_unsuccessful ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_connack_sent_reason | number of sent unsuccessful v3/v5 CONNACK packets in the last minute |
| [ vernemq_mqtt_disconnect_received_reason_not_normal ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_disconnect_received_reason | number of received not normal v5 DISCONNECT packets in the last minute |
| [ vernemq_mqtt_disconnect_sent_reason_not_normal ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_disconnect_sent_reason | number of sent not normal v5 DISCONNECT packets in the last minute |
| [ vernemq_mqtt_subscribe_error ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_subscribe_error | number of failed v3/v5 SUBSCRIBE operations in the last minute |
| [ vernemq_mqtt_subscribe_auth_error ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_subscribe_auth_error | number of unauthorized v3/v5 SUBSCRIBE attempts in the last minute |
| [ vernemq_mqtt_unsubscribe_error ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_unsubscribe_error | number of failed v3/v5 UNSUBSCRIBE operations in the last minute |
| [ vernemq_mqtt_publish_errors ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_publish_errors | number of failed v3/v5 PUBLISH operations in the last minute |
| [ vernemq_mqtt_publish_auth_errors ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_publish_auth_errors | number of unauthorized v3/v5 PUBLISH attempts in the last minute |
| [ vernemq_mqtt_puback_received_reason_unsuccessful ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_puback_received_reason | number of received unsuccessful v5 PUBACK packets in the last minute |
| [ vernemq_mqtt_puback_sent_reason_unsuccessful ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_puback_sent_reason | number of sent unsuccessful v5 PUBACK packets in the last minute |
| [ vernemq_mqtt_puback_unexpected ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_puback_invalid_error | number of received unexpected v3/v5 PUBACK packets in the last minute |
| [ vernemq_mqtt_pubrec_received_reason_unsuccessful ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_pubrec_received_reason | number of received unsuccessful v5 PUBREC packets in the last minute |
| [ vernemq_mqtt_pubrec_sent_reason_unsuccessful ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_pubrec_sent_reason | number of sent unsuccessful v5 PUBREC packets in the last minute |
| [ vernemq_mqtt_pubrec_invalid_error ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_pubrec_invalid_error | number of received unexpected v3 PUBREC packets in the last minute |
| [ vernemq_mqtt_pubrel_received_reason_unsuccessful ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_pubrel_received_reason | number of received unsuccessful v5 PUBREL packets in the last minute |
| [ vernemq_mqtt_pubrel_sent_reason_unsuccessful ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_pubrel_sent_reason | number of sent unsuccessful v5 PUBREL packets in the last minute |
| [ vernemq_mqtt_pubcomp_received_reason_unsuccessful ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_pubcomp_received_reason | number of received unsuccessful v5 PUBCOMP packets in the last minute |
| [ vernemq_mqtt_pubcomp_sent_reason_unsuccessful ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_pubcomp_sent_reason | number of sent unsuccessful v5 PUBCOMP packets in the last minute |
| [ vernemq_mqtt_pubcomp_unexpected ](https://github.com/netdata/netdata/blob/master/src/health/health.d/vernemq.conf) | vernemq.mqtt_pubcomp_invalid_error | number of received unexpected v3/v5 PUBCOMP packets in the last minute |
## Setup
### Prerequisites
No action required.
### Configuration
#### File
The configuration file name for this integration is `go.d/vernemq.conf`.
You can edit the configuration file using the `edit-config` script from the
Netdata [config directory](/docs/netdata-agent/configuration/README.md#the-netdata-config-directory).
```bash
cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config go.d/vernemq.conf
```
#### Options
The following options can be defined globally: update_every, autodetection_retry.
<details open><summary>Config options</summary>
| Name | Description | Default | Required |
|:----|:-----------|:-------|:--------:|
| update_every | Data collection frequency. | 1 | no |
| autodetection_retry | Recheck interval in seconds. Zero means no recheck will be scheduled. | 0 | no |
| url | Server URL. | http://127.0.0.1:8888/metrics | yes |
| timeout | HTTP request timeout. | 1 | no |
| username | Username for basic HTTP authentication. | | no |
| password | Password for basic HTTP authentication. | | no |
| proxy_url | Proxy URL. | | no |
| proxy_username | Username for proxy basic HTTP authentication. | | no |
| proxy_password | Password for proxy basic HTTP authentication. | | no |
| method | HTTP request method. | GET | no |
| body | HTTP request body. | | no |
| headers | HTTP request headers. | | no |
| not_follow_redirects | Redirect handling policy. Controls whether the client follows redirects. | no | no |
| tls_skip_verify | Server certificate chain and hostname validation policy. Controls whether the client performs this check. | no | no |
| tls_ca | Certification authority that the client uses when verifying the server's certificates. | | no |
| tls_cert | Client TLS certificate. | | no |
| tls_key | Client TLS key. | | no |
</details>
#### Examples
##### Basic
An example configuration.
<details open><summary>Config</summary>
```yaml
jobs:
- name: local
url: http://127.0.0.1:8888/metrics
```
</details>
##### HTTP authentication
Local instance with basic HTTP authentication.
<details open><summary>Config</summary>
```yaml
jobs:
- name: local
url: http://127.0.0.1:8888/metrics
username: username
password: password
```
</details>
##### Multi-instance
> **Note**: When you define multiple jobs, their names must be unique.
Local and remote instances.
<details open><summary>Config</summary>
```yaml
jobs:
- name: local
url: http://127.0.0.1:8888/metrics
- name: remote
url: http://203.0.113.10:8888/metrics
```
</details>
## Troubleshooting
### Debug Mode
**Important**: Debug mode is not supported for data collection jobs created via the UI using the Dyncfg feature.
To troubleshoot issues with the `vernemq` collector, run the `go.d.plugin` with the debug option enabled. The output
should give you clues as to why the collector isn't working.
- Navigate to the `plugins.d` directory, usually at `/usr/libexec/netdata/plugins.d/`. If that's not the case on
your system, open `netdata.conf` and look for the `plugins` setting under `[directories]`.
```bash
cd /usr/libexec/netdata/plugins.d/
```
- Switch to the `netdata` user.
```bash
sudo -u netdata -s
```
- Run the `go.d.plugin` to debug the collector:
```bash
./go.d.plugin -d -m vernemq
```
### Getting Logs
If you're encountering problems with the `vernemq` collector, follow these steps to retrieve logs and identify potential issues:
- **Run the command** specific to your system (systemd, non-systemd, or Docker container).
- **Examine the output** for any warnings or error messages that might indicate issues. These messages should provide clues about the root cause of the problem.
#### System with systemd
Use the following command to view logs generated since the last Netdata service restart:
```bash
journalctl _SYSTEMD_INVOCATION_ID="$(systemctl show --value --property=InvocationID netdata)" --namespace=netdata --grep vernemq
```
#### System without systemd
Locate the collector log file, typically at `/var/log/netdata/collector.log`, and use `grep` to filter for collector's name:
```bash
grep vernemq /var/log/netdata/collector.log
```
**Note**: This method shows logs from all restarts. Focus on the **latest entries** for troubleshooting current issues.
#### Docker Container
If your Netdata runs in a Docker container named "netdata" (replace if different), use this command:
```bash
docker logs netdata 2>&1 | grep vernemq
```