Labels

The labels processor lets you manipulate the labels of metrics.

Similar to filters, this processor presents an enriching/modifying mechanism to perform operations for labels manipulation. The most significant difference is that processors perform better than filters, and when chaining them there are no encoding or decoding performance penalties.

Only YAML configuration files support processors.

Configuration parameters

Key	Description
update	Updates an existing key with a value into metrics. The key/value pair is required. If the specified key doesn't exist, the operation silently fails and has no effect.
insert	Inserts a new key with a value into metrics. The key/value pair is required.
upsert	Upserts a specific key with a value, the upsert operation will try to update the value of the key. If the specified key doesn't exist, a new key will be created. The key/value pair is required.
delete	Deletes a key from the labels of metrics. The key/value pair is required. If the specified key doesn't exist, the operation silently fails and has no effect.
hash	Replaces the key value with a hash generated by the SHA-256 algorithm from the specified label name. The generated binary value is set as a hex string.

Update example

The following example changes the value of the name key to fluentbit:

fluent-bit.yaml

pipeline:
  inputs:
    - name: fluentbit_metrics

      processors:
        metrics:
          - name: labels
            update: name fluentbit
  
  outputs:
    - name : stdout
      match: '*'

Insert example

The following example appends the key agent with the value fluentbit as the label of metrics:

fluent-bit.yaml

pipeline:
  inputs:
    - name: fluentbit_metrics

      processors:
        metrics:
          - name: labels
            insert: agent fluentbit

  outputs:
    - name : stdout
      match: '*'

Upsert example

The following example upserts the value of name and inserts fluentbit:

fluent-bit.yaml

pipeline:
  inputs:
    - name: fluentbit_metrics

      processors:
        metrics:
          - name: labels
            upsert: name fluentbit
  
  outputs:
    - name : stdout
      match: '*'

Delete example

The following example deletes the name key from metrics:

fluent-bit.yaml

pipeline:
  inputs:
    - name: fluentbit_metrics

      processors:
        metrics:
          - name: labels
            delete: name
  
  outputs:
    - name : stdout
      match: '*'

Hash example

The following example applies the SHA-1 algorithm for the value of the key hostname:

fluent-bit.yaml

pipeline:
  inputs:
    - name: fluentbit_metrics

      processors:
        metrics:
          - name: labels
            hash: hostname

  outputs:
    - name : stdout
      match: '*'