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Documentation Grafana Agent Flow mode Reference Components loki.source.heroku

loki.source.heroku

loki.source.heroku listens for Heroku messages over TCP connections and forwards them to other loki.* components.

The component starts a new heroku listener for the given listener block and fans out incoming entries to the list of receivers in forward_to.

Before using loki.source.heroku, Heroku should be configured with the URL where the Agent will be listening. Follow the steps in Heroku HTTPS Drain docs for using the Heroku CLI with a command like the following:

shell Copy

heroku drains:add [http|https]://HOSTNAME:PORT/heroku/api/v1/drain -a HEROKU_APP_NAME

Multiple loki.source.heroku components can be specified by giving them different labels.

Usage

river Copy

loki.source.heroku "LABEL" {
    listener {
        address = "LISTEN_ADDRESS"
        port    = PORT
    }
    forward_to = RECEIVER_LIST
}

Arguments

loki.source.heroku supports the following arguments:

The relabel_rules field can make use of the rules export value from a loki.relabel component to apply one or more relabeling rules to log entries before they’re forwarded to the list of receivers in forward_to.

Blocks

The following blocks are supported inside the definition of loki.source.heroku:

listener block

The listener block defines the listen address and port where the listener expects Heroku messages to be sent to.

Labels

The labels map is applied to every message that the component reads.

The following internal labels all prefixed with __ are available but will be discarded if not relabeled:

• __heroku_drain_host
• __heroku_drain_app
• __heroku_drain_proc
• __heroku_drain_log_id

All url query params will be translated to __heroku_drain_param_<name>

If the X-Scope-OrgID header is set it will be translated to __tenant_id__

Exported fields

loki.source.heroku does not export any fields.

Component health

loki.source.heroku is only reported as unhealthy if given an invalid configuration.

Debug information

loki.source.heroku exposes some debug information per Heroku listener:

• Whether the listener is currently running.
• The listen address.

Debug metrics

• loki_source_heroku_drain_entries_total (counter): Number of successful entries received by the Heroku target.
• loki_source_heroku_drain_parsing_errors_total (counter): Number of parsing errors while receiving Heroku messages.

Example

This example listens for Heroku messages over TCP in the specified port and forwards them to a loki.write component using the Heroku timestamp.

river Copy

loki.source.heroku "local" {
    listener {
        address = "0.0.0.0"
        port    = 8080
    }
    use_incoming_timestamp = true
    labels                 = {component = "loki.source.heroku"}
    forward_to             = [loki.write.local.receiver]
}

loki.write "local" {
    endpoint {
        url = "loki:3100/api/v1/push"
    }
}