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Cassandra 🔗

Description 🔗

The Splunk Distribution of OpenTelemetry Collector provides this integration as the Cassandra monitor via the Smart Agent Receiver. It monitors Cassandra using the GenericJMX plugin. It serves as a wrapper around the genericjmx monitor that comes with a set of predefined MBean definitions that a standard Cassandra deployment will expose.

See signalfx-agent/pkg/monitors/collectd/cassandra/ for the monitor source.

Installation 🔗

This monitor is available in the SignalFx Smart Agent Receiver, which is part of the Splunk Distribution of OpenTelemetry Collector.

To install this integration:

  1. Deploy the Splunk Distribution of OpenTelemetry Collector to your host or container platform.

  2. Configure the monitor, as described in the next section.

Configuration 🔗

The Splunk Distribution of OpenTelemetry Collector allows embedding a Smart Agent monitor configuration in an associated Smart Agent Receiver instance.

Note: Providing a Cassandra monitor entry in your Smart Agent or Collector configuration is required for its use. Use the appropriate form for your agent type.

Smart Agent 🔗

To activate this monitor in the Smart Agent, add the following to your agent configuration:

monitors:  # All monitor config goes under this key
 - type: collectd/cassandra
   ...  # Additional config

See Smart Agent example configuration for an autogenerated example of a YAML configuration file, with default values where applicable.

Splunk Distribution of OpenTelemetry Collector 🔗

To activate this monitor in the Splunk Distribution of OpenTelemetry Collector, add the following to your agent configuration:

receivers:
  smartagent/cassandra:
    type: collectd/cassandra
    ...  # Additional config

To complete the monitor activation, you must also include the smartagent/cassandra receiver item in a metrics pipeline. To do this, add the receiver item to the service > pipelines > metrics > receivers section of your configuration file.

See configuration examples for specific use cases that show how the collector can integrate and complement existing environments.

Configuration settings 🔗

The following table shows the configuration options for this monitor:

Option Required Type Description
host yes string Host to connect to -- JMX must be configured for remote access and accessible from the agent
port yes integer JMX connection port (NOT the RMI port) on the application. This corresponds to the com.sun.management.jmxremote.port Java property that should be set on the JVM when running the application.
name no string
serviceName no string This is how the service type is identified in the Splunk Observability Cloud UI so that you can get built-in content for it. For custom JMX integrations, it can be set to whatever you like and metrics will get the special property sf_hostHasService set to this value.
serviceURL no string The JMX connection string. This is rendered as a Go template and has access to the other values in this config. NOTE: under normal circumstances it is not advised to set this string directly - setting the host and port as specified above is preferred. (default: service:jmx:rmi:///jndi/rmi://{{.Host}}:{{.Port}}/jmxrmi)
instancePrefix no string Adds a prefix to the generated plugin instance with. If a second instancePrefix is specified in a referenced MBean block, the prefix specified in the Connection block will appear at the beginning of the plugin instance, and the prefix specified in the MBean block will be appended to it
username no string Username to authenticate to the server
password no string User password to authenticate to the server
customDimensions no map of strings Takes in key-value pairs of custom dimensions at the connection level.
mBeansToCollect no list of strings A list of the MBeans defined in mBeanDefinitions to collect. If not provided, then all defined MBeans will be collected.
mBeansToOmit no list of strings A list of the MBeans to omit. This will come in handy in cases where only a few MBeans need to be omitted from the default list.
mBeanDefinitions no map of objects (see below) Specifies how to map JMX MBean values to metrics. If using a specific service monitor such as cassandra, kafka, or activemq, they come pre-loaded with a set of mappings, and any that you add in this option will be merged with those. See GenericJMX for more details.

The nested mBeanDefinitions configuration object has the following fields:

Option

Required

Type

Description

objectName

no

string

Sets the pattern used to retrieve MBeans from the MBeanServer. If more than one MBean is returned, you should use the instanceFrom option to make the identifiers unique.

instancePrefix

no

string

Prefixes the generated plugin instance with prefix

instanceFrom

no

list of strings

The object names used by JMX to identify MBeans include so-called “properties” which are basically key-value pairs. If the given object name is not unique and multiple MBeans are returned, the values of those properties usually differ. You can use this option to build the plugin instance from the appropriate property values. This option is optional and may be repeated to generate the plugin instance from multiple property values.

values

no

list of objects (see below)

The value blocks map one or more attributes of an MBean to a value list in collectd. There must be at least one value block within each MBean block

dimensions

no

list of strings

The nested values configuration object has the following fields:

Option

Required

Type

Description

type

no

string

Sets the data set used within collectd to handle the values of the MBean attribute

table

no

bool

Set this to true if the returned attribute is a composite type. If set to true, the keys within the composite type are appended to the type instance. (default: false)

instancePrefix

no

string

Works like the option of the same name directly beneath the MBean block, but sets the type instance instead

instanceFrom

no

list of strings

Works like the option of the same name directly beneath the MBean block, but sets the type instance instead

attribute

no

string

Sets the name of the attribute from which to read the value. You can access the keys of composite types by using a dot to concatenate the key name to the attribute name. For example: “attrib0.key42”. If table is set to true, path must point to a composite type, otherwise it must point to a numeric type.

attributes

no

list of strings

The plural form of the attribute config above. Used to derive multiple metrics from a single MBean.

Metrics 🔗

These are the metrics available for this integration: