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Important: This documentation is about an older version. It's relevant only to the release noted, many of the features and functions have been updated or replaced. Please view the current version.

loki.source.kubernetes_events

Open source

loki.source.kubernetes_events

loki.source.kubernetes_events tails events from the Kubernetes API and converts them into log lines to forward to other loki components.

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

Usage

loki.source.kubernetes_events "LABEL" {
  forward_to = RECEIVER_LIST
}

Arguments

The component starts a new reader for each of the given targets and fans out log entries to the list of receivers passed in forward_to.

loki.source.kubernetes_events supports the following arguments:

Name	Type	Description	Default	Required
`job_name`	`string`	Value to use for `job` label for generated logs.	`"loki.source.kubernetes_events"`	no
`namespaces`	`list(string)`	Namespaces to watch for Events in.	`[]`	no
`forward_to`	`list(LogsReceiver)`	List of receivers to send log entries to.		yes

By default, loki.source.kubernetes_events will watch for events in all namespaces. A list of explicit namespaces to watch can be provided in the namespaces argument.

NOTE: When watching all namespaces, Grafana Agent must have permissions to watch events at the cluster scope (such as using a ClusterRoleBinding). If an explicit list of namespaces is provided, Grafana Agent only needs permissions to watch events for those namespaces.

Log lines generated by loki.source.kubernetes_events have the following labels:

namespace: Namespace of the Kubernetes object involved in the event.
job: Value specified by the job_name argument.
instance: Value matching the component ID.

If job_name argument is the empty string, the component will fail to load. To remove the job label, forward the output of loki.source.kubernetes_events to a loki.relabel component.

For compatibility with the eventhandler integration from static mode, job_name can be set to "integrations/kubernetes/eventhandler".

Blocks

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

Hierarchy	Block	Description	Required
client	client	Configures Kubernetes client used to tail logs.	no
client > basic_auth	basic_auth	Configure basic_auth for authenticating to the endpoint.	no
client > authorization	authorization	Configure generic authorization to the endpoint.	no
client > oauth2	oauth2	Configure OAuth2 for authenticating to the endpoint.	no
client > oauth2 > tls_config	tls_config	Configure TLS settings for connecting to the endpoint.	no
client > tls_config	tls_config	Configure TLS settings for connecting to the endpoint.	no

The > symbol indicates deeper levels of nesting. For example, client > basic_auth refers to a basic_auth block defined inside a client block.

client block

The client block configures the Kubernetes client used to tail logs from containers. If the client block isn’t provided, the default in-cluster configuration with the service account of the running Grafana Agent pod is used.

The following arguments are supported:

Name	Type	Description	Default	Required
`api_server`	`string`	URL of the Kubernetes API server.		no
`kubeconfig_file`	`string`	Path of the `kubeconfig` file to use for connecting to Kubernetes.		no
`bearer_token`	`secret`	Bearer token to authenticate with.		no
`bearer_token_file`	`string`	File containing a bearer token to authenticate with.		no
`proxy_url`	`string`	HTTP proxy to proxy requests through.		no
`follow_redirects`	`bool`	Whether redirects returned by the server should be followed.	`true`	no
`enable_http2`	`bool`	Whether HTTP2 is supported for requests.	`true`	no

At most one of the following can be provided:

bearer_token argument.
bearer_token_file argument.
basic_auth block.
authorization block.
oauth2 block.

basic_auth block

Name	Type	Description	Required
`username`	`string`	Basic auth username.	no
`password`	`secret`	Basic auth password.	no
`password_file`	`string`	File containing the basic auth password.	no

password and password_file are mutually exclusive and only one can be provided inside of a basic_auth block.

authorization block

Name	Type	Description	Required
`type`	`string`	Authorization type, for example, “Bearer”.	no
`credentials`	`secret`	Secret value.	no
`credentials_file`	`string`	File containing the secret value.	no

credential and credentials_file are mutually exclusive and only one can be provided inside of an authorization block.

oauth2 block

Name	Type	Description	Required
`client_id`	`string`	OAuth2 client ID.	no
`client_secret`	`secret`	OAuth2 client secret.	no
`client_secret_file`	`string`	File containing the OAuth2 client secret.	no
`scopes`	`list(string)`	List of scopes to authenticate with.	no
`token_url`	`string`	URL to fetch the token from.	no
`endpoint_params`	`map(string)`	Optional parameters to append to the token URL.	no
`proxy_url`	`string`	Optional proxy URL for OAuth2 requests.	no

client_secret and client_secret_file are mutually exclusive and only one can be provided inside of an oauth2 block.

The oauth2 block may also contain its own separate tls_config sub-block.

tls_config block

Name	Type	Description	Required
`ca_pem`	`string`	CA PEM-encoded text to validate the server with.	no
`ca_file`	`string`	CA certificate to validate the server with.	no
`cert_pem`	`string`	Certificate PEM-encoded text for client authentication.	no
`cert_file`	`string`	Certificate file for client authentication.	no
`key_pem`	`secret`	Key PEM-encoded text for client authentication.	no
`key_file`	`string`	Key file for client authentication.	no
`server_name`	`string`	ServerName extension to indicate the name of the server.	no
`insecure_skip_verify`	`bool`	Disables validation of the server certificate.	no
`min_version`	`string`	Minimum acceptable TLS version.	no

The following pairs of arguments are mutually exclusive and cannot 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

loki.source.kubernetes_events does not export any fields.

Component health

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

Debug information

loki.source.kubernetes_events exposes the most recently read timestamp for events in each watched namespace.

Debug metrics

loki.source.kubernetes_events does not expose any component-specific debug metrics.

Example

This example collects watches events in the kube-system namespace and forwards them to a loki.write component so they are written to Loki.

loki.source.kubernetes_events "example" {
  // Only watch for events in the kube-system namespace.
  namespaces = ["kube-system"]

  forward_to = [loki.write.local.receiver]
}

loki.write "local" {
  endpoint {
    url = env("LOKI_URL")
  }
}

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