Relabel

Available in Logging Operator version 4.2 and later.

The relabel output uses the relabel output plugin of Fluentd to route events back to a specific Flow, where they can be processed again.

This is useful, for example, if you need to preprocess a subset of logs differently, but then do the same processing on all messages at the end. In this case, you can create multiple flows for preprocessing based on specific log matchers and then aggregate everything into a single final flow for postprocessing.

The value of the label parameter of the relabel output must be the same as the value of the flowLabel parameter of the Flow (or ClusterFlow) where you want to send the messages.

For example:

apiVersion: logging.banzaicloud.io/v1beta1
kind: ClusterOutput
metadata:
  name: final-relabel
spec:
  relabel:
    label: '@final-flow'
---
apiVersion: logging.banzaicloud.io/v1beta1
kind: Flow
metadata:
  name: serviceFlow1
  namespace: namespace1
spec:
  filters: []
  globalOutputRefs:
  - final-relabel
  match:
  - select:
      labels:
        app: service1
---
apiVersion: logging.banzaicloud.io/v1beta1
kind: Flow
metadata:
  name: serviceFlow2
  namespace: namespace2
spec:
  filters: []
  globalOutputRefs:
  - final-relabel
  match:
  - select:
      labels:
        app: service2
---
apiVersion: logging.banzaicloud.io/v1beta1
kind: ClusterFlow
metadata:
  name: final-flow
spec:
  flowLabel: '@final-flow'
  includeLabelInRouter: false
  filters: []

Using the relabel output also makes it possible to pass the messages emitted by the Concat plugin in case of a timeout. Set the timeout_label of the concat plugin to the flowLabel of the flow where you want to send the timeout messages.

Output Config

label (string, required) {#output config-label}

Specifies new label for events