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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.

Note

This component requires Role-based access control (RBAC) to be set up in Kubernetes in order for Alloy to access it via the Kubernetes REST API.

Note

Alloy version 1.1 and higher supports clustered mode in this component. When you use this component as part of a cluster of Alloy instances, only a single instance from the cluster will update rules using the Mimir API.

Usage

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

Arguments

mimir.rules.kubernetes supports the following arguments:

NameTypeDescriptionDefaultRequired
addressstringURL of the Mimir ruler.yes
tenant_idstringMimir tenant ID.no
use_legacy_routesboolWhether to use [deprecated][gem-2_2] ruler API endpoints.falseno
prometheus_http_prefixstringPath prefix for [Mimir’s Prometheus endpoint][gem-path-prefix]./prometheusno
sync_intervaldurationAmount of time between reconciliations with Mimir.“5m”no
mimir_namespace_prefixstringPrefix used to differentiate multiple Alloy deployments.“alloy”no
bearer_token_filestringFile containing a bearer token to authenticate with.no
bearer_tokensecretBearer token to authenticate with.no
enable_http2boolWhether HTTP2 is supported for requests.trueno
follow_redirectsboolWhether redirects returned by the server should be followed.trueno
proxy_urlstringHTTP proxy to send requests through.no
no_proxystringComma-separated list of IP addresses, CIDR notations, and domain names to exclude from proxying.no
proxy_from_environmentboolUse the proxy URL indicated by environment variables.falseno
proxy_connect_headermap(list(secret))Specifies headers to send to proxies during CONNECT requests.no
external_labelsmap(string)Labels to add to each rule.{}no

At most, one of the following can be provided:

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:

HierarchyBlockDescriptionRequired
extra_query_matchersextra_query_matchersAdditional label matchers to add to each query.no
extra_query_matchers > matchermatcherA label matcher to add to query.no
rule_namespace_selectorlabel_selectorLabel selector for Namespace resources.no
rule_namespace_selector > match_expressionmatch_expressionLabel match expression for Namespace resources.no
rule_selectorlabel_selectorLabel selector for PrometheusRule resources.no
rule_selector > match_expressionmatch_expressionLabel match expression for PrometheusRule resources.no
basic_authbasic_authConfigure basic_auth for authenticating to the endpoint.no
authorizationauthorizationConfigure generic authorization to the endpoint.no
oauth2oauth2Configure OAuth2 for authenticating to the endpoint.no
oauth2 > tls_configtls_configConfigure TLS settings for connecting to the endpoint.no
tls_configtls_configConfigure TLS settings for connecting to the endpoint.no

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:

NameTypeDescriptionDefaultRequired
namestringName of the label to match.yes
match_typestringThe type of match. One of =, !=, =~ and !~.yes
valuestringValue of the label to match.yes

label_selector block

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

The following arguments are supported:

NameTypeDescriptionDefaultRequired
match_labelsmap(string)Label keys and values used to discover resources.{}yes

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:

NameTypeDescriptionDefaultRequired
keystringThe label name to match against.yes
operatorstringThe operator to use when matching.yes
valueslist(string)The values used when matching.no

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

NameTypeDescriptionDefaultRequired
password_filestringFile containing the basic auth password.no
passwordsecretBasic auth password.no
usernamestringBasic auth username.no

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

authorization block

NameTypeDescriptionDefaultRequired
credentials_filestringFile containing the secret value.no
credentialssecretSecret value.no
typestringAuthorization type, for example, “Bearer”.no

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

oauth2 block

NameTypeDescriptionDefaultRequired
client_idstringOAuth2 client ID.no
client_secret_filestringFile containing the OAuth2 client secret.no
client_secretsecretOAuth2 client secret.no
endpoint_paramsmap(string)Optional parameters to append to the token URL.no
proxy_urlstringHTTP proxy to send requests through.no
no_proxystringComma-separated list of IP addresses, CIDR notations, and domain names to exclude from proxying.no
proxy_from_environmentboolUse the proxy URL indicated by environment variables.falseno
proxy_connect_headermap(list(secret))Specifies headers to send to proxies during CONNECT requests.no
scopeslist(string)List of scopes to authenticate with.no
token_urlstringURL to fetch the token from.no

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

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

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

Metric NameTypeDescription
mimir_rules_config_updates_totalcounterNumber of times the configuration has been updated.
mimir_rules_events_totalcounterNumber of events processed, partitioned by event type.
mimir_rules_events_failed_totalcounterNumber of events that failed to be processed, partitioned by event type.
mimir_rules_events_retried_totalcounterNumber of events that were retried, partitioned by event type.
mimir_rules_client_request_duration_secondshistogramDuration of requests to the Mimir API.

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
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
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
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
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