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Open source

prometheus.exporter.memcached

The prometheus.exporter.memcached component embeds memcached_exporter for collecting metrics from a Memcached server.

Usage

river 
prometheus.exporter.memcached "LABEL" {
}

Arguments

The following arguments are supported:

NameTypeDescriptionDefaultRequired
addressstringThe Memcached server address."localhost:11211"no
timeoutdurationThe timeout for connecting to the Memcached server."1s"no

Blocks

The following blocks are supported inside the definition of prometheus.exporter.memcached:

HierarchyBlockDescriptionRequired
tls_configtls_configTLS configuration for requests to the Memcached server.no

tls_config block

NameTypeDescriptionDefaultRequired
ca_pemstringCA PEM-encoded text to validate the server with.no
ca_filestringCA certificate to validate the server with.no
cert_pemstringCertificate PEM-encoded text for client authentication.no
cert_filestringCertificate file for client authentication.no
insecure_skip_verifyboolDisables validation of the server certificate.no
key_filestringKey file for client authentication.no
key_pemsecretKey PEM-encoded text for client authentication.no
min_versionstringMinimum acceptable TLS version.no
server_namestringServerName extension to indicate the name of the server.no

The following pairs of arguments are mutually exclusive and can’t both be set simultaneously:

  • ca_pem and ca_file
  • cert_pem and cert_file
  • key_pem and key_file

When configuring client authentication, both the client certificate (using cert_pem or cert_file) and the client key (using key_pem or key_file) must be provided.

When min_version is not provided, the minimum acceptable TLS version is inherited from Go’s default minimum version, TLS 1.2. If min_version is provided, it must be set to one of the following strings:

  • "TLS10" (TLS 1.0)
  • "TLS11" (TLS 1.1)
  • "TLS12" (TLS 1.2)
  • "TLS13" (TLS 1.3)

Exported fields

The following fields are exported and can be referenced by other components.

NameTypeDescription
targetslist(map(string))The targets that can be used to collect exporter metrics.

For example, the targets can either be passed to a discovery.relabel component to rewrite the targets’ label sets or to a prometheus.scrape component that collects the exposed metrics.

The exported targets use the configured in-memory traffic address specified by the run command.

Component health

prometheus.exporter.memcached is only reported as unhealthy if given an invalid configuration. In those cases, exported fields retain their last healthy values.

Debug information

prometheus.exporter.memcached does not expose any component-specific debug information.

Debug metrics

prometheus.exporter.memcached does not expose any component-specific debug metrics.

Example

This example uses a prometheus.exporter.memcached component to collect metrics from a Memcached server running locally, and scrapes the metrics using a prometheus.scrape component:

river 
prometheus.exporter.memcached "example" {
  address = "localhost:13321"
  timeout = "5s"
}

prometheus.scrape "example" {
  targets    = [prometheus.exporter.memcached.example.targets]
  forward_to = [prometheus.remote_write.demo.receiver]
}

prometheus.remote_write "demo" {
  endpoint {
    url = PROMETHEUS_REMOTE_WRITE_URL

    basic_auth {
      username = USERNAME
      password = PASSWORD
    }
  }
}

Replace the following:

  • PROMETHEUS_REMOTE_WRITE_URL: The URL of the Prometheus remote_write-compatible server to send metrics to.
  • USERNAME: The username to use for authentication to the remote_write API.
  • PASSWORD: The password to use for authentication to the remote_write API.

Compatible components

prometheus.exporter.memcached has exports that can be consumed by the following components:

Note

Connecting some components may not be sensible or components may require further configuration to make the connection work correctly. Refer to the linked documentation for more details.