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Source Processor

Stability level: Beta

The sourceprocessor adds _sourceName and other tags related to Sumo Logic metadata taxonomy.

It is recommended to use k8sprocessor to provide attributes used in default values.

Configuration

processors:
  source:
    # Name of the collector, put in `_collector` tag.
    # default: ""
    collector: <collector>

    # Template for source host, put in `_sourceHost` tag.
    # default: "%{k8s.pod.hostname}"
    source_host: <source_host>

    # Template for source name, put in `_sourceName` tag.
    # default: "%{k8s.namespace.name}.%{k8s.pod.name}.%{k8s.container.name}"
    source_name: <source_name>

    # Template for source category, put in `_sourceCategory` tag.
    # default: "%{k8s.namespace.name}/%{k8s.pod.pod_name}"
    source_category: <source_category>
    # Prefix added before each `_sourceCategory` value.
    # default: "kubernetes/"
    source_category_prefix: <source_category_prefix>
    # Character which all dashes ("-") in source category value are being replaced to.
    # default: "/"
    source_category_replace_dash: <source_category_replace_dash>

    # A mapping of resource attribute names to exclusion regexes for the attribute values.
    # Whenever a value under a particular attribute matches the corresponding regex,
    # the processed record is dropped.
    # default: {}
    exclude:
      <attribute_key_1>: <attribute_value_regex_1>
      <attribute_key_2>: <attribute_value_regex_2>

    # Prefix which allows to find given annotation; it is used for including/excluding pods, among other attributes.
    # default: "k8s.pod.annotation."
    annotation_prefix: <annotation_prefix>

    # Name of the attribute that contains the full name of the pod.
    # default: "k8s.pod.name"
    pod_key: <pod_key>

    # Name of the attribute that will contain the deuniquified name of the pod.
    # Here are some examples of deuniquified pod names:
    # - for a daemonset pod `dset-otelcol-sumo-xa314` it's going to be `dset-otelcol-sumo`
    # - for a deployment pod `dep-otelcol-sumo-75675f5861-qasd2` it's going to be `dep-otelcol-sumo`
    # - for a statefulset pod `st-otelcol-sumo-0` it's going to be `st-otelcol-sumo`
    # default: "k8s.pod.pod_name"
    pod_name_key: <pod_name_key>

    # Name of the attribute that contains pod's template hash. It is used for pod name extraction.
    # default: "k8s.pod.label.pod-template-hash"
    pod_template_hash_key: <pod_template_hash_key>

    # See "Container-level pod annotations" section below
    container_annotations:
      # Specifies whether container-level annotations are enabled.
      # default: false
      enabled: {true, false}
      # Name of the attribute that contains the container name.
      # default: "k8s.container.name"
      container_name_key: <container_name_key>
      # List of prefixes for container-level pod annotations.
      # default: ["sumologic.com/"]
      prefixes:
      - <prefix_1>
      - <prefix_2>

Source templates

You can specify a template with an attribute for source_category, source_host, source_name, using %{attr_name}.

For example, when there is an attribute my_attr: my_value, metrics/%{my_attr} will be expanded to metrics/my_value.

If an attribute is not found, it is replaced with undefined. For example, %{existing_attr}/%{nonexistent_attr} becomes value-of-existing-attr/undefined.

Name translation and template keys

For example, when default template for source_category is being used (%{k8s.namespace.name}/%{k8s.pod.pod_name}), the resource has attributes:

k8s.namespace.name: my-namespace
k8s.pod.pod_name: some-name

and the default values for source_category_prefix and source_category_replace_dash are used (kubernetes/ and /), then the _sourceCategory attribute will contain: kubernetes/my/namespace/some/name

Example config

processors:
  source:
    collector: "mycollector"
    source_name: "%{k8s.namespace.name}.%{k8s.pod.name}.%{k8s.container.name}"
    source_category: "%{k8s.namespace.name}/%{k8s.pod.pod_name}"
    source_category_prefix: "kubernetes/"
    source_category_replace_dash: "/"
    exclude:
      namespace: "kube-system"
      pod: "custom-pod-.*"

Pod annotations

The following Kubernetes annotations can be used on pods:

  • sumologic.com/exclude - records from a pod that has this annotation set to true are dropped,

    NOTE: this has precedence over sumologic.com/include if both are set at the same time for one pod.

  • sumologic.com/include - records from a pod that has this annotation set to true are not checked against exclusion regexes from exclude processor settings

  • sumologic.com/sourceCategory - overrides source_category config option

  • sumologic.com/sourceCategoryPrefix - overrides source_category_prefix config option

  • sumologic.com/sourceCategoryReplaceDash - overrides source_category_replace_dash config option

  • sumologic.com/sourceHost - overrides source_host config option; the value of this annotation will be set as the value of the _sourceHost resource attribute

  • sumologic.com/sourceName - overrides source_name config option; the value of this annotation will be set as the value of the _sourceName resource attribute

For the processor to use them, the annotations need to be available as resource attributes, prefixed with the value defined in keys.annotation_prefix config option. This can be achieved with the Kubernetes processor.

For example, if a resource has the k8s.pod.annotation.sumologic.com/exclude attribute set to true, the resource will be dropped.

Container-level pod annotations

To make it possible to set different metadata on logs from different containers inside a pod, it is possible to set pod annotations that are container-specific.

The following rules apply:

  • Container-level annotations take precendence over other forms of setting the source category.
  • No other transformations are applied to the source categories retrieved from container-level annotations, like adding source category prefix or replacing the dash.

Let's look at an example. Assuming this plugin is configured with the following properties:

processors:
  source:
    container_annotations:
      enabled: true
      prefixes:
      - sumologic.com/

and assuming there's a pod running that has containers named container-name-1 and container-name-2 in it, setting the following annotations on the pod:

  • sumologic.com/container-name-1.sourceCategory with the value of first_source-category
  • sumologic.com/container-name-2.sourceCategory with the value of another/source-category

will make the logs from container-name-1 be tagged with source category first_source-category and logs from container-name-2 be tagged with source category another/source-category.

If there is more than one prefix defined in container_annotations.prefixes, they are checked in the order they are defined in. If an annotation is found for one prefix, the other prefixes are not checked.