Postgres Pro Enterprise : Documentation: 15: mamonsu : Postgres Professional

mamonsu
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mamonsu

mamonsu — a monitoring agent for collecting Postgres Pro and system metrics

Synopsis

mamonsu agent [agent_action]

mamonsu bootstrap -M mamonsu_user [-c | --config] [-x | --create-extensions] [connection_options]

mamonsu export {template | config} filename [export_options]

mamonsu report [report_options] [connection_options]

mamonsu tune [tuning_options] [connection_options]

mamonsu upload [upload_options]

mamonsu zabbix dashboard upload template_name

mamonsu zabbix {template | host | hostgroup} server_action

mamonsu zabbix item {error | lastvalue | lastclock} host_id

mamonsu zabbix version

mamonsu [-c | --config] [-d | --daemonize]

mamonsu --version

mamonsu --help

Description

mamonsu is a monitoring agent for collecting Postgres Pro and system metrics that can be visualized on the Zabbix server. Unlike the native Zabbix Agent configured to collect Postgres Pro metrics, mamonsu uses a single database connection, which allows to minimize performance impact on the monitored system.

The mamonsu agent includes the following components:

A supervisor process that monitors database and system activity.
Plugins that specify which Postgres Pro and system metrics to collect.
Customizable configuration and template files that define which plugins to use and how to visualize the collected data.

mamonsu is an active agent, which means that it sends the data to the Zabbix server once it is collected. Pre-configured to monitor multiple Postgres Pro and system metrics out of the box, mamonsu can be extended with your own custom plugins to track other metrics critical for your system.

mamonsu also provides the command-line interface for updating some Zabbix server settings, as well as getting an overview of the monitored system configuration and tuning Postgres Pro and system settings on the fly. You can find the list of all mamonsu commands in the section called “Command-Line Reference”.

Installation and Setup

Important

Before you start installation, attentively read Compatibility Considerations.

To use mamonsu, you must create a Zabbix account and set up a Zabbix server as explained in Zabbix documentation. Naturally, you must also have a Postgres Pro instance up and running if you are going to monitor Postgres Pro metrics. If you are configuring your Postgres Pro cluster from scratch, see Chapter 17 and Section 18.2 for Postgres Pro installation and setup instructions, respectively.

Note

While mamonsu can collect Postgres Pro metrics from a remote cluster, system metrics are only collected locally. If you choose to collect Postgres Pro metrics remotely, make sure to disable collection of system metrics to avoid confusion, as they will be displayed under the same host in Zabbix.

mamonsu is provided with Postgres Pro Enterprise as a separate pre-built package mamonsu (for the detailed installation instructions, see Chapter 17). Once you have installed mamonsu, complete the following steps to set up metrics collection:

Optionally, bootstrap mamonsu
If you omit this step, metrics can only be collected on behalf of a superuser, which is not recommended.
In this step, the bootstrap command sets the mamonsu user, creates mamonsu schema in the specified or implied database, as well as extensions and objects needed for monitoring.
bootstrap has no mandatory options. When run without options, it takes the values needed from the configuration file (/etc/mamonsu/agent.conf by default). Below is a simple example of bootstrap:
1. In the [postgres] section of agent.conf, specify connection parameters for the Postgres Pro cluster you are going to monitor. For more details, see Connection Parameters.
2. Run the following command to bootstrap mamonsu:
```
mamonsu bootstrap
```
  This command will create the user mamonsu with the password mamonsu, create monitoring functions in the database specified in agent.conf and grant the right to execute them to the mamonsu user.
In the following example, bootstrap options are passed explicitly.
1. Create a non-privileged database user for mamonsu. For example:
```
CREATE USER mamonsu_user WITH PASSWORD 'mamonsu_password';
GRANT pg_monitor TO mamonsu_user;
```
2. Create a database that will be used for connection to Postgres Pro. For example:
```
CREATE DATABASE mamonsu_database OWNER mamonsu_user;
```
3. Run the following command to bootstrap mamonsu:
```
mamonsu bootstrap -M mamonsu_user -x -c /etc/mamonsu/agent.conf -d mamonsu_database -U postgres --host myhost --port 5432
```
  For details of the options -M, -x and -c, see bootstrap. For details of other options, see Connection Options. This command will create monitoring functions in the mamonsu_database and grant the right to execute them to mamonsu_user. The pg_buffercache extension will also be created to ensure collection of metrics on the shared buffer cache, and the path to the configuration file will be changed.
As a result, a superuser connection is no longer required. Note that mamonsu also creates several tables in the mamonsu schema in the specified database. Do not delete these tables as they are required for mamonsu to work.
Configure mamonsu
Edit the agent.conf configuration file, which is located in the /etc/mamonsu/ directory by default.
- Configure Zabbix-related settings. The address field must point to the running Zabbix server, while the client field must provide the name of the Zabbix host. You can find the list of hosts available for your account in the Zabbix web interface under Configuration > Hosts.
```
[zabbix]
; enabled by default
enabled = True
client = zabbix_host_name
address = zabbix_server
```
- By default, mamonsu will collect both Postgres Pro and system metrics. If required, you can disable metrics collection of either type by setting the enabled parameter to False in the [postgres] or [system] section of the agent.conf file, respectively.
```
[system]
; enabled by default
enabled = True
```
  Note
  While mamonsu can collect Postgres Pro metrics from a remote cluster, system metrics are only collected locally. If you choose to collect Postgres Pro metrics remotely, make sure to disable collection of system metrics to avoid confusion, as they will be displayed under the same host in Zabbix.
- If you are going to collect Postgres Pro metrics, specify connection parameters for the Postgres Pro cluster you are going to monitor. In the user, password, and database fields, you must specify the mamonsu_user, mamonsu_password, and the mamonsu_database used for bootstrap, respectively. If you skipped the bootstrap, specify superuser credentials and the database to connect to.
```
[postgres]
; enabled by default
enabled = True
user = mamonsu_user
database = mamonsu_database
password = mamonsu_password
port = 5432
```
These are the main mamonsu settings to get started. You can also fine-tune other mamonsu settings as explained in the section called “Configuration Parameters”.
Configure how to display metrics on the Zabbix server
1. Generate a template that defines how to visualize the collected metrics on the Zabbix server:
```
mamonsu export template template.xml
```
  mamonsu generates the template.xml file in your current directory. By default, the name of the template that will be displayed in the Zabbix account is PostgresPro-OS, where OS is the name of your operating system. To get a template with a different display name, you can run the above command with the --template-name option.
2. Optionally, specify your Zabbix account settings in the following environment variables on your monitoring system:
  - Set the ZABBIX_USER and ZABBIX_PASSWD variables to the login and password of your Zabbix account, respectively.
  - Set the ZABBIX_URL to http://zabbix/
  If you skip this step, you will have to add the following options to all mamonsu zabbix commands that you run:
```
--url=http://zabbix/ --user=zabbix_login --password=zabbix_password
```
3. Upload template.xml to the Zabbix server.
```
mamonsu zabbix template export template.xml
```
  Alternatively, you can upload the template through the Zabbix web interface: log in to your Zabbix account and select Templates > Import.
4. Link the generated template to the host to be monitored.
  In the Zabbix web interface, select your host, go to Templates > Add, select your template, and click Update.
  Tip
  If you would like to link a template with a new Zabbix host, you can do it from the command line using mamonsu zabbix commands. See the section called “Managing Zabbix Server Settings from the Command Line” for details.

When the setup is complete, start mamonsu. For example, on Linux systems, you can start mamonsu as a service with the following command:

service mamonsu start

mamonsu picks up all the parameters from the mamonsu configuration file and starts monitoring your system.

Command-Line Reference

agent

Syntax:

mamonsu agent { metric-list | metric-get metric_name | version }

Provide information on the collected metrics from the command line. You can specify one of the following parameters:

metric-list: Show the list of metrics that mamonsu is collecting. The output of this command provides the item key of each metric, its latest value, and the time when this value was received.
metric-get metric_name: Check the latest value for the specified metric. You can get the list of available metrics using the metric-list option.
version: Display mamonsu version.

bootstrap

Syntax:

mamonsu bootstrap -M mamonsu_user
        [-c[ config_file] | --config[=config_file]]
        [-x | --create-extensions] [connection_options]

Bootstrap mamonsu. This command can take the following options:

-M

Specify a non-privileged user that will own all mamonsu processes.

-c config_file --config=config_file

Specify the agent.conf file where the [postgres] section contains the database name to be used if --dbname is not specified through connection_options.

Default: /etc/mamonsu/agent.conf

-x --create-extensions

Create auxiliary extensions. The pg_buffercache extension will be created, which is no longer created by default. For Postgres Pro 12 or higher, the bootstrap -x command will also create functions to work with the pgpro_stats extension and grant the right to execute them to the mamonsu user.

connection_options

Provide optional command-line connection parameters.

export

Syntax:

mamonsu export config filename.conf  [--add-plugins=plugin_directory]
mamonsu export template filename.xml [--add-plugins=plugin_directory]
                                     [--template-name=template_name]
                                     [--application=application_name]
                                     [--old-zabbix]

Generate a template or configuration file for metrics collection. The optional parameters to customize metrics collection are as follows:

--add-plugins=plugin_directory

Collect metrics that are defined in custom plugins located in the specified plugin_directory. If you are going to use custom plugins, you must provide this option when generating both the configuration file and the template.

--template-name=template_name

Specify the name of the template that will be displayed on the Zabbix server.

Default: PostgresPro-OS, where OS is the name of your operating system

--application=application_name

Specify an identifier under which the collected metrics will be displayed on the Zabbix server.

Default: App-PostgresPro-OS, where OS is the name of your operating system

--old-zabbix

Export a template for Zabbix server version 4.2 or lower. By default, the template is generated in a format compatible with Zabbix 4.4 or higher.

export zabbix-parameters

Syntax:

mamonsu export zabbix-parameters filename.conf [--add-plugins=plugin_directory]
                                     [--plugin-type={pg | sys | all}]
                                     [--pg-version=version]
                                     [--config=config_file]

Export metrics configuration for use with the native Zabbix agent. The optional parameters to customize metrics collection are as follows:

--add-plugins=plugin_directory

--plugin-type={pg | sys | all}

Specify the type of metrics to collect:

pg for Postgres Pro metrics.
sys for system metrics.
all for both Postgres Pro and system metrics.

Default: all

--pg-version=version

Specify the major version of the server for which to configure metrics collection. mamonsu can collect metrics for all supported Postgres Pro versions, as well as PostgreSQL versions starting from 9.5.

Default: 10

--config=config_file

Specify the agent.conf file to be used as the source for metrics definitions.

Default: /etc/mamonsu/agent.conf

export zabbix-template

Syntax:

mamonsu export zabbix-template filename.conf [--add-plugins=plugin_directory]
                                     [--plugin-type={pg | sys | all}]
                                     [--template-name=template_name]
                                     [--application=application_name]
                                     [--config=config_file]
                                     [--old-zabbix]

Export a template for use with the native Zabbix agent. The optional parameters to customize metrics collection are as follows:

--add-plugins=plugin_directory

--plugin-type={pg | sys | all}

Specify the type of metrics to collect:

pg configures Postgres Pro metrics.
sys configures system metrics.
all configures both Postgres Pro and system metrics.

Default: all

--template-name=template_name

Specify the name of the template that will be displayed on the Zabbix server.

Default: PostgresPro-OS, where OS is the name of your operating system

--application=application_name

Specify an identifier under which the collected metrics will be displayed on the Zabbix server.

Default: App-PostgresPro-OS, where OS is the name of your operating system

--config=config_file

Specify the agent.conf file to be used as the source for metrics definitions.

Default: /etc/mamonsu/agent.conf

--old-zabbix

Export a template for Zabbix server version 4.2 or lower. By default, the template is generated in a format compatible with Zabbix 4.4 or higher.

report

Syntax:

mamonsu report [--run-system=Boolean] [--run-postgres=Boolean]
               [--print-report=Boolean] [--report-path=report_file]
               [--disable-sudo] [connection_options]

Generate a detailed report on the hardware, operating system, memory usage and other parameters of the monitored system, as well as Postgres Pro configuration.

The following optional parameters customize the report:

--run-system=Boolean

Include system information into the generated report.

Default: True

--run-postgres=Boolean

Include information on Postgres Pro into the generated report.

Default: True

--print-report=Boolean

Print the report to stdout.

Default: True

--report-path=report_file

Save the report into the specified file.

Default: /tmp/report.txt

--disable-sudo

Do not report data that can only be received with superuser rights. This option is only available for Linux systems.

connection_options

Provide optional command-line connection parameters.

tune

Syntax:

mamonsu tune [--dry-run] [--disable-sudo] [--log-level {INFO|DEBUG|WARN}]
             [--dont-tune-pgbadger] [--dont-reload-postgresql]
             [connection_options]

Optimize Postgres Pro and system configuration based on the collected statistics. You can use the following options:

--dry-run

Display the settings to be tuned without changing the actual system and Postgres Pro configuration.

--disable-sudo

Do not tune the settings that can only be changed by a superuser. This option is only available for Linux systems.

--dont-tune-pgbadger

Do not tune pgbadger parameters.

--log-level { INFO | DEBUG | WARN}

Change the logging level.

Default: INFO

--dont-reload-postgresql

Forbid mamonsu to run the pg_reload_conf() function. If you specify this option, the modified settings that require reloading Postgres Pro configuration do not take effect immediately.

connection_options

Provide optional command-line connection parameters.

upload

Syntax:

mamonsu upload [--zabbix-file=metrics_file]
               [--zabbix-address=zabbix_address] [--zabbix-port=port_number] 
               [--zabbix-client=zabbix_host_name] [--zabbix-log-level={INFO|DEBUG|WARN}]

Upload metrics data previously saved into a file onto a Zabbix server for visualization. For details on how to save metrics into a file, see the section called “Logging Parameters”.

This command can take the following options:

--zabbix-address=zabbix_address

The address of the Zabbix server.

Default: localhost

--zabbix-port=port_number

The port of the Zabbix server.

Default: 10051

--zabbix-file=metrics_file

A text file that stores the collected metrics data to be visualized, such as localhost.log.

--zabbix-client=zabbix_host_name

The name of the Zabbix host.

Default: localhost

--zabbix-log-level={INFO|DEBUG|WARN}

Change the logging level.

Default: INFO

zabbix dashboard upload

Syntax:

mamonsu dashboard upload template_name

Upload a Zabbix dashboard with the mamonsu metrics to a template on the Zabbix server version 6.0 or higher.

zabbix item

Syntax:

mamonsu zabbix item {error | lastvalue | lastclock } host_name

View the specified property of the latest metrics data received by Zabbix for the specified host.

zabbix version

Syntax:

mamonsu zabbix version

Get the version of the Zabbix server that mamonsu is connected to.

zabbix host

Syntax:

mamonsu zabbix host list
mamonsu zabbix host show host_name
mamonsu zabbix host id host_name
mamonsu zabbix host delete host_id
mamonsu zabbix host create host_name hostgroup_id template_id mamonsu_address
mamonsu zabbix host info {templates | hostgroups | graphs | items} host_id

Manage Zabbix hosts using one of the actions described in the section called “Zabbix Server Actions”.

zabbix hostgroup

Syntax:

mamonsu zabbix hostgroup list
mamonsu zabbix hostgroup show hostgroup_name
mamonsu zabbix hostgroup id hostgroup_name
mamonsu zabbix hostgroup delete hostgroup_id
mamonsu zabbix hostgroup create hostgroup_name

Manage Zabbix host groups using one of the actions described in the section called “Zabbix Server Actions”.

zabbix template

Syntax:

mamonsu zabbix template list
mamonsu zabbix template show template_name
mamonsu zabbix template id template_name
mamonsu zabbix template delete template_id
mamonsu zabbix template export file

Manage Zabbix templates using one of the actions described in the section called “Zabbix Server Actions”.

[--config] [--daemonize]

Syntax:

mamonsu [-c config_file | --config=config_file]
        [-d | --daemonize]

Start working as a monitoring agent in the foreground or in the background using configuration parameters loaded from the configuration file. If the specified or default configuration file does not exist, exit with an error. Useful for debugging. You can specify the following options:

-c config_file --config=config_file

Specify the agent.conf file where to load the configuration parameters from.

Default: /etc/mamonsu/agent.conf

-d --daemonize

Run in the background. Without it, mamonsu will run in the foreground.

--version

Syntax:

mamonsu --version

Display mamonsu version.

--help

Syntax:

mamonsu --help

Display mamonsu command-line help.

Connection Options

connection_options provide command-line connection parameters for the target Postgres Pro cluster. connection_options can be --host, --port, --dbname (-d), --username (-U), and --password (-W). The --dbname option should specify the mamonsu_database created for monitoring purposes. Note that the --username (-U) option must specify a superuser that can access the cluster.

If you omit connection_options, mamonsu checks the configuration file for the needed settings.

Zabbix Server Actions

Using mamonsu, you can control some of the Zabbix server functionality from the command line. Specifically, you can create or delete Zabbix hosts and host groups, as well as generate, import, and delete Zabbix templates using one of the following commands. The object_name to use must correspond to the type of the Zabbix object specified in the command: template, host, or hostgroup.

list: Display the list of available templates, hosts, or host groups.
show object_name: Display the details about the specified template, host, or host group.
id object_name: Show the ID of the specified object, which is assigned automatically by the Zabbix server.
delete object_id: Delete the object with the specified ID.
create hostgroup_name create host_name hostgroup_id template_id mamonsu_address: Create a new host or a host group.
export template_name: Generate a Zabbix template.
info {templates | hostgroups | graphs | items} host_id: Display detailed information about the templates, host groups, graphs, and metrics available on the host with the specified ID.

Configuration Parameters

The agent.conf configuration file is located in the /etc/mamonsu directory by default. It provides several groups of parameters that control which metrics to collect and how to log the collected data:

All parameters must be specified in the parameter = value format.

Connection Parameters

[postgres]

The [postgres] section controls Postgres Pro metrics collection and can contain the following parameters:

enabled

Enables/disables Postgres Pro metrics collection if set to True or False, respectively.

Default: True

user

The user on behalf of which the cluster will be monitored. It must be the mamonsu user set in bootstrap, or a superuser if bootstrap was not run.

Default: postgres

password

The password for the specified user.

database

The database to connect to for metrics collection.

Default: postgres

host

The server address to connect to.

Default: localhost

port

The port to connect to.

Default: 5432

application_name

Application name that identifies mamonsu connected to the Postgres Pro cluster.

Default: mamonsu

query_timeout

statement_timeout for the mamonsu session, in seconds. If a Postgres Pro metric query does not complete within this time interval, it gets terminated.

Default: 10

Alternatively you can specify environment variables rather than the configuration parameters. The following environment variables can be used: PGUSER, PGPASSWORD, PGHOST, PGDATABASE, PGPORT, and PGAPPNAME. See Section 35.15 for their meaning.

[system]

The [system] section controls system metrics collection and can contain the following parameters:

enabled

Enables/disables system metrics collection if set to True or False, respectively.

Default: True

[zabbix]

The [zabbix] section provides connection settings for the Zabbix server and can contain the following parameters:

enabled

Enables/disables sending the collected metrics data to the Zabbix server if set to True or False, respectively.

Default: True

client

The name of the Zabbix host.

address

The address of the Zabbix server.

Default: 127.0.0.1

port

The port of the Zabbix server.

Default: 10051

timeout

Maximum time to wait while connecting to the Zabbix server, in seconds.

Default: 15

[agent]

The [agent] section specifies the location of mamonsu and whether it is allowed to access metrics from the command line:

enabled

Enables/disables metrics collection from the command line using the agent command.

Default: True

host

The address of the system on which mamonsu is running.

Default: 127.0.0.1

port

The port on which mamonsu is running.

Default: 10052

[sender]

The [sender] section controls the queue size of the data to be sent to the Zabbix server:

queue

The maximum number of collected metric values that can be accumulated locally before mamonsu sends them to the Zabbix server. Once the accumulated data is sent, the queue is cleared.

Default: 2048

Logging Parameters

[metric_log]

The [metric_log] section enables storing the collected metrics data in text files locally. This section can contain the following parameters:

enabled

Enables/disables storing the collected metrics data in a text file. If this option is set to True, mamonsu creates the localhost.log file for storing metric values.

Default: False

directory

Specifies the directory where log files with metrics data will be stored.

Default: /var/log/mamonsu

max_size_mb

The maximum size of a log file, in MB. When the specified size is reached, it is renamed to localhost.log.archive, and an empty localhost.log file is created.

Default: 1024

[log]

The [log] section specifies logging settings for mamonsu and can contain the following parameters:

file

Specifies the log filename, which can be preceded by the full path.

level

Specifies the debug level. This option can take DEBUG, ERROR, or INFO values.

Default: INFO

format

The format of the logged data.

Default: [%(levelname)s] %(asctime)s - %(name)s - %(message)s

where levelname is the debug level, asctime returns the current time, name specifies the plugin that emitted this log entry or root otherwise, and message provides the actual log message.

Plugin Parameters

[plugins]

The [plugins] section specifies custom plugins to be added for metrics collection and can contain the following parameters:

enabled

Enables/disables using custom plugins for metrics collection if set to True or False, respectively.

Default: False

directory

Specifies the directory that contains custom plugins for metrics collection. Setting this parameter to None forbids using custom plugins.

Default: /etc/mamonsu/plugins

If you need to configure any of the plugins you add to mamonsu after installation, you have to add this plugin section to the agent.conf file.

The syntax of this section should follow the syntax used with the examples shown below in the section called “Individual Plugin Sections”.

Individual Plugin Sections

All built-in plugins are installed along with mamonsu. To configure a built-in plugin you should find a corresponding section below the Individual Plugin Sections heading and edit its parameter values:

enabled

Enables/disables using built-in plugins if set to True or False, respectively. These values are case-sensitive.

Default: False

interval

Specifies the plugin operation interval, in seconds. The parameter is set with an integer specifying the plugin operation interval in seconds. You can set different intervals for different plugins. For plugins that collect PostgreSQL/ Postgres Pro metrics, for example, autovacuum, checkpoint, etc., this is the interval within which mamonsu accesses the Postgres Pro instance for metrics collection. For system plugins, for example, diskstats, memory, etc., this is the interval within which the operating system is accessed. For service plugins, for example, agentapi, logsender, zbxsender, this is the interval within which their functions are called. Note that the interval parameter of the zbxsender plugin is associated with the timeout parameter of the [zabbix] section. The maximum Zabbix server response timeout greater than the plugin operation interval may cause misbehavior of the zbxsender plugin: the plugin restarts with an error message if the connection or data transfer require longer time than the value specified in the interval parameter.

Default: 60

The example below shows individual plugin sections corresponding to the preparedtransaction and the pgprobackup built-in plugins:

[preparedtransaction]
max_prepared_transaction_time = 60
interval = 60

[pgprobackup]
enabled = false
interval = 300
backup_dirs = /backup_dir1,/backup_dir2
pg_probackup_path = /usr/bin/pg_probackup-11

[preparedtransaction]

This plugin gets age in seconds of the oldest prepared transaction and number of all transactions prepared for a two-phase commit. For additional information refer to PREPARE TRANSACTION and Section 55.17.

The max_prepared_transaction_time parameter specifies the threshold in seconds for the age of the prepared transaction.

The plugin collects two metrics: pgsql.prepared.count (number of prepared transactions) and pgsql.prepared.oldest (oldest prepared transaction age in seconds).

If pgsql.prepared.oldest value exceeds the threshold specified by the max_prepared_transaction_time parameter, a trigger with the following message is fired: "PostgreSQL prepared transaction is too old on {host}".

[pgprobackup]

This plugin uses pg_probackup to track its backups' state and gets size of backup directories which store all backup files.

Please note that this plugin counts the total size of all files in the target directory. Make sure that extraneous files are not stored in this directory.

The backup_dirs parameter specifies a comma-separated list of paths to directories for which metrics should be collected.

The pg_probackup_path parameter specifies the path to pg_probackup.

By default this plugin is disabled. To enable it set the enabled parameter to True.

This plugin collects two metrics: pg_probackup.dir.size[#backup_directory] (the size of the target directory) and pg_probackup.dir.error[#backup_directory] (backup errors) for each specified backup_directory.

If any generated backup has bad status, like ERROR, CORRUPT, ORPHAN, a trigger is fired.

Usage

Collecting and Viewing Metrics Data

Once started, mamonsu begins collecting system and Postgres Pro metrics. The agent command enables you to get an overview of the collected metrics from the command line in real time.

To view the list of available metrics, use the agent metric-list command:

mamonsu agent metric-list

The output of this command provides the item key of each metric, its latest value, and the time when this value was received. For example:

system.memory[active]      7921004544    1564570818
system.memory[swap_cache]      868352    1564570818
pgsql.connections[idle]           6.0    1564570818
pgsql.archive_command[failed_trying_to_archive]    0    1564570818

To view the current value for a specific metric, you can use the agent metric-get command:

mamonsu agent metric-get metric_name

where metric_name is the item key of the metric to monitor, as returned by the metric-list command. For example, pgsql.connections[idle].

You can view graphs for the collected metrics in the Zabbix web interface under the Graphs menu. For details on working with Zabbix, see its official documentation at https://www.zabbix.com/documentation/current/manual.

If you have chosen to save all the collected metrics data into a file, as explained in the section called “Logging Parameters”, you can later upload these metrics onto a Zabbix server for visualization using the upload command.

Adding Custom Plugins

You can extend mamonsu with your own custom plugins, as follows:

Save all custom plugins in a single directory, such as /etc/mamonsu/plugins.
Make sure this directory is specified in your configuration file under the [plugins] section:
```
[plugins]
directory = /etc/mamonsu/plugins
```

Generate a new Zabbix template to include custom plugins:

mamonsu export template template.xml --add-plugins=/etc/mamonsu/plugins

Upload the generated template.xml to the Zabbix server as explained in the section called “Installation and Setup”.

Tuning Postgres Pro and System Configuration

Based on the collected metrics data, mamonsu can tune your Postgres Pro and system configuration for optimal performance.

You can get detailed information about the hardware, operating system, memory usage and other parameters of the monitored system, as well as Postgres Pro configuration, as follows:

mamonsu report

To view the suggested optimizations without applying them, run the tune command with the --dry-run option:

mamonsu tune --dry-run

To apply all the suggested changes, run the tune command without any parameters:

mamonsu tune

You can exclude some settings from the report or disable some of the optimizations by passing optional parameters. See the section called “Command-Line Reference” for the full list of parameters available for report and tune commands.

Managing Zabbix Server Settings from the Command Line

mamonsu enables you to work with the Zabbix server from the command line. You can upload template files to Zabbix, create and delete Zabbix hosts and host groups, link templates with hosts and check the latest metric values.

To set up your Zabbix host from scratch, you can follow these steps:

Optionally, specify your Zabbix account settings in the following environment variables on your monitoring system:
- Set the ZABBIX_USER and ZABBIX_PASSWD variables to the login and password of your Zabbix account, respectively.
- Set the ZABBIX_URL to http://zabbix/
If you skip this step, you will have to add the following options to all mamonsu zabbix commands that you run:
```
--url=http://zabbix/ --user=zabbix_login --password=zabbix_password
```

Generate a new template file and upload it to the Zabbix server:

mamonsu export template template.xml
mamonsu zabbix template export template.xml

Create a new host group:

mamonsu zabbix hostgroup create hostgroup_name

Check the IDs for this host group and the uploaded template, which are assigned automatically by the Zabbix server:
```
mamonsu zabbix hostgroup id hostgroup_name
mamonsu zabbix template id template_name
```
Create a host associated with this group and link it with the uploaded template using a single command:
```
mamonsu zabbix host create host_name hostgroup_id template_id mamonsu_address
       
```
where host_name is the name of the host, hostgroup_id and template_id are the unique IDs returned in the previous step, and mamonsu_address is the IP address of the system on which mamonsu runs.

Once your Zabbix host is configured, complete the setup of your monitoring system as explained in the section called “Installation and Setup”.

Exporting Metrics for Native Zabbix Agent

Using mamonsu, you can convert system and Postgres Pro metrics definitions to the format supported by the native Zabbix agent.

This feature currently has the following limitations:

You cannot export metrics if you run mamonsu on Windows systems.
Metrics definitions for pg_wait_sampling and CFS features available in Postgres Pro Enterprise are not converted.

Important

To work with Zabbix proxy, you must export settings to the format supported by the native Zabbix agent.

To collect metrics provided by mamonsu using the native Zabbix agent, do the following:

Generate a configuration file that is compatible with the native Zabbix agent and place it under /etc/zabbix/zabbix_agent.d/. You can prepend the filename with the required path:
```
mamonsu export zabbix-parameters /etc/zabbix/zabbix_agent.d/zabbix_agent.conf
```
For all possible options of the export zabbix-parameters command, see the section called “Command-Line Reference”.
Generate a template for the native Zabbix agent:
```
mamonsu export zabbix-template template.xml
```
For all possible options of the export zabbix-template command, see the section called “Command-Line Reference”.
Upload the generated template to the Zabbix server, as explained in the section called “Installation and Setup”.
If you are going to collect Postgres Pro metrics, change the following macros in the template after the upload:
- For {$PG_CONNINFO}, provide connection parameters for the Postgres Pro server to be monitored.
- For {$PG_PATH}, specify psql installation directory.

Compatibility Considerations

If you want to upgrade mamonsu to a version that is not compatible with the previous one, what you must do to continue using the application depends on whether you need to retain the metrics data collected.

If you need to retain the collected data, do the following:
1. Install the new version of mamonsu.
2. Generate a new template for the Zabbix server.
3. If you performed a bootstrap using the previous version of mamonsu, run the bootstrap command again.
4. Upload the new template to the Zabbix server.
5. Rename the host for which you want to retain the collected data and leave the old template linked to that host.
6. Create a new host for the same system and link the new template to it.
7. Restart mamonsu. It will collect data for the new host. The old host will no longer be used, but the data collected will be available.
If you do not need to retain the collected data, do the following:
1. Install the new version of mamonsu.
2. Generate a new template for the Zabbix server.
3. If you performed a bootstrap using the previous version of mamonsu, run the bootstrap command again.
4. Upload the new template to the Zabbix server.
5. In the settings of the Zabbix host, link the new template to the host instead of the old one.
6. Restart mamonsu. It will start collecting data. All the data collected earlier will be lost.

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