Documentation Grafana Cloud Instrument and send data Grafana Alloy Reference Components mimir mimir.rules.kubernetes

mimir.rules.kubernetes

mimir.rules.kubernetes discovers PrometheusRule Kubernetes resources and loads them into a Mimir instance.

• Multiple mimir.rules.kubernetes components can be specified by giving them different labels.
• Kubernetes label selectors can be used to limit the Namespace and PrometheusRule resources considered during reconciliation.
• Compatible with the Ruler APIs of Grafana Mimir, Grafana Cloud, and Grafana Enterprise Metrics.
• Compatible with the PrometheusRule CRD from the prometheus-operator.
• This component accesses the Kubernetes REST API from within a Pod.

Usage

alloy Copy

mimir.rules.kubernetes "LABEL" {
  address = MIMIR_RULER_URL
}

Arguments

mimir.rules.kubernetes supports the following arguments:

At most, one of the following can be provided:

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

no_proxy can contain IPs, CIDR notations, and domain names. IP and domain names can contain port numbers. proxy_url must be configured if no_proxy is configured.

proxy_from_environment uses the environment variables HTTP_PROXY, HTTPS_PROXY, and NO_PROXY (or the lowercase versions thereof). Requests use the proxy from the environment variable matching their scheme, unless excluded by NO_PROXY. proxy_url and no_proxy must not be configured if proxy_from_environment is configured.

proxy_connect_header should only be configured if proxy_url or proxy_from_environment are configured.

If no tenant_id is provided, the component assumes that the Mimir instance at address is running in single-tenant mode and no X-Scope-OrgID header is sent.

The sync_interval argument determines how often Mimir’s ruler API is accessed to reload the current state of rules. Interaction with the Kubernetes API works differently. Updates are processed as events from the Kubernetes API server according to the informer pattern.

The mimir_namespace_prefix argument can be used to separate the rules managed by multiple Alloy deployments across your infrastructure. It should be set to a unique value for each deployment.

If use_legacy_routes is set to true, mimir.rules.kubernetes contacts Mimir on a /api/v1/rules endpoint.

If prometheus_http_prefix is set to /mimir, mimir.rules.kubernetes contacts Mimir on a /mimir/config/v1/rules endpoint. This is useful if you configure Mimir to use a different [prefix][gem-path-prefix] for its Prometheus endpoints than the default one.

prometheus_http_prefix is ignored if use_legacy_routes is set to true.

external_labels will override label values if labels with the same names already exist inside the rule.

Blocks

The following blocks are supported inside the definition of mimir.rules.kubernetes:

The > symbol indicates deeper levels of nesting. For example, oauth2 > tls_config refers to a tls_config block defined inside an oauth2 block.

extra_query_matchers block

The extra_query_matchers block has no attributes. It contains zero or more matcher blocks. These blocks allow you to add extra label matchers to all queries that are discovered by mimir.rules.kubernetes component. The algorithm of adding the label matchers to queries is the same as the one provided by promtool promql label-matchers set command in promtool.

matcher block

The matcher block describes a label matcher that will be added to each query found in PrometheusRule CRDs.

The following arguments are supported:

label_selector block

The label_selector block describes a Kubernetes label selector for rule or namespace discovery.

The following arguments are supported:

When the match_labels argument is empty, all resources will be matched.

match_expression block

The match_expression block describes a Kubernetes label match expression for rule or namespace discovery.

The following arguments are supported:

The operator argument should be one of the following strings:

• "In"
• "NotIn"
• "Exists"
• "DoesNotExist"

The values argument must not be provided when operator is set to "Exists" or "DoesNotExist".

basic_auth block

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

authorization block

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

oauth2 block

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

The oauth2 block may also contain a separate tls_config sub-block.

no_proxy can contain IPs, CIDR notations, and domain names. IP and domain names can contain port numbers. proxy_url must be configured if no_proxy is configured.

proxy_from_environment uses the environment variables HTTP_PROXY, HTTPS_PROXY, and NO_PROXY (or the lowercase versions thereof). Requests use the proxy from the environment variable matching their scheme, unless excluded by NO_PROXY. proxy_url and no_proxy must not be configured if proxy_from_environment is configured.

proxy_connect_header should only be configured if proxy_url or proxy_from_environment are configured.

tls_config block

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 isn’t 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

mimir.rules.kubernetes does not export any fields.

Component health

mimir.rules.kubernetes is reported as unhealthy if given an invalid configuration or an error occurs during reconciliation.

Debug information

mimir.rules.kubernetes exposes resource-level debug information.

The following are exposed per discovered PrometheusRule resource:

• The Kubernetes namespace.
• The resource name.
• The resource uid.
• The number of rule groups.

The following are exposed per discovered Mimir rule namespace resource:

• The namespace name.
• The number of rule groups.

Only resources managed by the component are exposed - regardless of how many actually exist.

Debug metrics

Example

This example creates a mimir.rules.kubernetes component that loads discovered rules to a local Mimir instance under the team-a tenant. Only namespaces and rules with the alloy label set to yes are included.

alloy Copy

mimir.rules.kubernetes "local" {
    address = "mimir:8080"
    tenant_id = "team-a"

    rule_namespace_selector {
        match_labels = {
            alloy = "yes",
        }
    }

    rule_selector {
        match_labels = {
            alloy = "yes",
        }
    }
}

This example creates a mimir.rules.kubernetes component that loads discovered rules to Grafana Cloud. It also adds a "label1" label to each rule. If that label already exists, it is overwritten with "value1".

alloy Copy

mimir.rules.kubernetes "default" {
    address = "GRAFANA_CLOUD_METRICS_URL"
    basic_auth {
        username = "GRAFANA_CLOUD_USER"
        password = "GRAFANA_CLOUD_API_KEY"
        // Alternatively, load the password from a file:
        // password_file = "GRAFANA_CLOUD_API_KEY_PATH"
    }
    external_labels = {"label1" = "value1"}
}

This example adds label matcher {cluster=~"prod-.*"} to all the queries discovered by mimir.rules.kubernetes.

alloy Copy

mimir.rules.kubernetes "default" {
    address = "GRAFANA_CLOUD_METRICS_URL"
    extra_query_matchers {
        matcher {
            name = "cluster"
            match_type = "=~"
            value = "prod-.*"
        }
    }
}

If a query in the form of up != 1 is found in PrometheusRule CRDs, it will be modified to up{cluster=~"prod-.*"} != 1 before sending it to Mimir.

The following example is an RBAC configuration for Kubernetes. It authorizes Alloy to query the Kubernetes REST API:

yaml Copy

apiVersion: v1
kind: ServiceAccount
metadata:
  name: alloy
  namespace: default
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: alloy
rules:
- apiGroups: [""]
  resources: ["namespaces"]
  verbs: ["get", "list", "watch"]
- apiGroups: ["monitoring.coreos.com"]
  resources: ["prometheusrules"]
  verbs: ["get", "list", "watch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: alloy
subjects:
- kind: ServiceAccount
  name: alloy
  namespace: default
roleRef:
  kind: ClusterRole
  name: alloy
  apiGroup: rbac.authorization.k8s.io