You can specify the following options in the apm-server.api_key.* section of the apm-server.yml configuration file. They apply to API key communication between the APM Server and APM Agents.

enablededit

Enable API key authorization by setting enabled to true. By default, enabled is set to false, and API key support is disabled.

limitedit

Each unique API key triggers one request to Elasticsearch. This setting restricts the number of unique API keys are allowed per minute. The minimum value for this setting should be the number of API keys configured in your monitored services. The default limit is 100.

api_key.elasticsearch.* configuration optionsedit

All of the api_key.elasticsearch.* configurations are optional. If none are set, configuration settings from the apm-server.output section will be reused.

elasticsearch.hostsedit

API keys are fetched from Elasticsearch. This configuration needs to point to a secured Elasticsearch cluster that is able to serve API key requests.

elasticsearch.protocoledit

The name of the protocol Elasticsearch is reachable on. The options are: http or https. The default is http. If nothing is configured, configuration settings from the output section will be reused.

elasticsearch.pathedit

An optional HTTP path prefix that is prepended to the HTTP API calls. If nothing is configured, configuration settings from the output section will be reused.

elasticsearch.proxy_urledit

The URL of the proxy to use when connecting to the Elasticsearch servers. The value may be either a complete URL or a "host[:port]", in which case the "http"scheme is assumed. If nothing is configured, configuration settings from the output section will be reused.

elasticsearch.timeoutedit

The http request timeout in seconds for the Elasticsearch request. If nothing is configured, configuration settings from the output section will be reused.

api_key.elasticsearch.ssl.* configuration optionsedit

SSL is off by default. Set elasticsearch.protocol to https if you want to enable https.

elasticsearch.ssl.enablededit

Enable custom SSL settings. Set to false to ignore custom SSL settings for secure communication.

elasticsearch.ssl.verification_modeedit

Configure SSL verification mode. If none is configured, all server hosts and certificates will be accepted. In this mode, SSL based connections are susceptible to man-in-the-middle attacks. Use only for testing. Default is full.

elasticsearch.ssl.supported_protocolsedit

List of supported/valid TLS versions. By default, all TLS versions from 1.0 to 1.2 are enabled.

elasticsearch.ssl.certificate_authoritiesedit

List of root certificates for HTTPS server verifications.

elasticsearch.ssl.certificateedit

The path to the certificate for SSL client authentication.

elasticsearch.ssl.keyedit

The client certificate key used for client authentication. This option is required if certificate is specified.

elasticsearch.ssl.key_passphraseedit

An optional passphrase used to decrypt an encrypted key stored in the configured key file. It is recommended to use the provided keystore instead of entering the passphrase in plain text.

elasticsearch.ssl.cipher_suitesedit

The list of cipher suites to use. The first entry has the highest priority. If this option is omitted, the Go crypto library’s default suites are used (recommended).

elasticsearch.ssl.curve_typesedit

The list of curve types for ECDHE (Elliptic Curve Diffie-Hellman ephemeral key exchange).

elasticsearch.ssl.renegotiationedit

Configure what types of renegotiation are supported. Valid options are never, once, and freely. Default is never.