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feat(fluentbit): add flush interval options to the log_to_metrics filter #2084

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5c5d395
feat(fluentbit): add flush interval options to the log_to_metrics filter
cvas22 Oct 28, 2026
3dc36bb
chore: regenerate deepcopy, CRDs, manifests and docs for the log_to_m…
cvas22 Oct 28, 2026
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15 changes: 15 additions & 0 deletions apis/fluentbit/v1alpha2/plugins/filter/log_to_metrics_types.go
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,15 @@ type LogToMetrics struct {
// Flag that defines if logs should be discarded after processing. This applies
// for all logs, no matter if they have emitted metrics or not.
DiscardLogs *bool `json:"discardLogs,omitempty"`
// The interval for metrics emission, in seconds. If flushIntervalSec and flushIntervalNsec are both
// unset or 0, metrics are emitted right after each filter match. Otherwise they are emitted at
// this interval, which lowers resource usage under high load.
// +kubebuilder:validation:Minimum:=0
FlushIntervalSec *int32 `json:"flushIntervalSec,omitempty"`
// The interval for metrics emission, in nanoseconds. Works together with flushIntervalSec.
// +kubebuilder:validation:Minimum:=0
// +kubebuilder:validation:Maximum:=999999999
FlushIntervalNsec *int32 `json:"flushIntervalNsec,omitempty"`
}

func (*LogToMetrics) Name() string {
Expand Down Expand Up @@ -109,5 +118,11 @@ func (l *LogToMetrics) Params(_ plugins.SecretLoader) (*params.KVs, error) {
if l.DiscardLogs != nil {
kvs.Insert("Discard_logs", fmt.Sprintf("%t", *l.DiscardLogs))
}
if l.FlushIntervalSec != nil {
kvs.Insert("Flush_Interval_Sec", fmt.Sprintf("%d", *l.FlushIntervalSec))
}
if l.FlushIntervalNsec != nil {
kvs.Insert("Flush_Interval_Nsec", fmt.Sprintf("%d", *l.FlushIntervalNsec))
}
return kvs, nil
}
49 changes: 49 additions & 0 deletions apis/fluentbit/v1alpha2/plugins/filter/log_to_metrics_types_test.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,49 @@
package filter

import (
"testing"

"github.com/fluent/fluent-operator/v3/apis/fluentbit/v1alpha2/plugins"
"github.com/fluent/fluent-operator/v3/apis/fluentbit/v1alpha2/plugins/params"
. "github.com/onsi/gomega"
)

func TestFilter_LogToMetrics_FlushInterval(t *testing.T) {
g := NewGomegaWithT(t)

sl := plugins.NewSecretLoader(nil, "test namespace")

l := LogToMetrics{
Tag: "metrics",
MetricMode: "counter",
MetricName: "count_all",
FlushIntervalSec: new(int32(30)),
FlushIntervalNsec: new(int32(500000000)),
}

expected := params.NewKVs()
expected.Insert("Tag", "metrics")
expected.Insert("Metric_mode", "counter")
expected.Insert("Metric_name", "count_all")
expected.Insert("Flush_Interval_Sec", "30")
expected.Insert("Flush_Interval_Nsec", "500000000")

kvs, err := l.Params(sl)
g.Expect(err).NotTo(HaveOccurred())
g.Expect(kvs).To(Equal(expected))
}

func TestFilter_LogToMetrics_NoFlushInterval(t *testing.T) {
g := NewGomegaWithT(t)

sl := plugins.NewSecretLoader(nil, "test namespace")

l := LogToMetrics{Tag: "metrics"}

expected := params.NewKVs()
expected.Insert("Tag", "metrics")

kvs, err := l.Params(sl)
g.Expect(err).NotTo(HaveOccurred())
g.Expect(kvs).To(Equal(expected))
}
10 changes: 10 additions & 0 deletions apis/fluentbit/v1alpha2/plugins/filter/zz_generated.deepcopy.go
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15 changes: 15 additions & 0 deletions charts/fluent-operator-fluent-bit-crds/templates/fluentbit.fluent.io_clusterfilters.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -367,6 +367,21 @@ spec:
items:
type: string
type: array
flushIntervalNsec:
description: The interval for metrics emission, in nanoseconds.
Works together with flushIntervalSec.
format: int32
maximum: 999999999
minimum: 0
type: integer
flushIntervalSec:
description: |-
The interval for metrics emission, in seconds. If flushIntervalSec and flushIntervalNsec are both
unset or 0, metrics are emitted right after each filter match. Otherwise they are emitted at
this interval, which lowers resource usage under high load.
format: int32
minimum: 0
type: integer
kubernetesMode:
description: |-
If enabled, it will automatically put pod_id, pod_name, namespace_name, docker_id and container_name
Expand Down
15 changes: 15 additions & 0 deletions charts/fluent-operator-fluent-bit-crds/templates/fluentbit.fluent.io_filters.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -367,6 +367,21 @@ spec:
items:
type: string
type: array
flushIntervalNsec:
description: The interval for metrics emission, in nanoseconds.
Works together with flushIntervalSec.
format: int32
maximum: 999999999
minimum: 0
type: integer
flushIntervalSec:
description: |-
The interval for metrics emission, in seconds. If flushIntervalSec and flushIntervalNsec are both
unset or 0, metrics are emitted right after each filter match. Otherwise they are emitted at
this interval, which lowers resource usage under high load.
format: int32
minimum: 0
type: integer
kubernetesMode:
description: |-
If enabled, it will automatically put pod_id, pod_name, namespace_name, docker_id and container_name
Expand Down
15 changes: 15 additions & 0 deletions charts/fluent-operator/crds/fluentbit.fluent.io_clusterfilters.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -365,6 +365,21 @@ spec:
items:
type: string
type: array
flushIntervalNsec:
description: The interval for metrics emission, in nanoseconds.
Works together with flushIntervalSec.
format: int32
maximum: 999999999
minimum: 0
type: integer
flushIntervalSec:
description: |-
The interval for metrics emission, in seconds. If flushIntervalSec and flushIntervalNsec are both
unset or 0, metrics are emitted right after each filter match. Otherwise they are emitted at
this interval, which lowers resource usage under high load.
format: int32
minimum: 0
type: integer
kubernetesMode:
description: |-
If enabled, it will automatically put pod_id, pod_name, namespace_name, docker_id and container_name
Expand Down
15 changes: 15 additions & 0 deletions charts/fluent-operator/crds/fluentbit.fluent.io_filters.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -365,6 +365,21 @@ spec:
items:
type: string
type: array
flushIntervalNsec:
description: The interval for metrics emission, in nanoseconds.
Works together with flushIntervalSec.
format: int32
maximum: 999999999
minimum: 0
type: integer
flushIntervalSec:
description: |-
The interval for metrics emission, in seconds. If flushIntervalSec and flushIntervalNsec are both
unset or 0, metrics are emitted right after each filter match. Otherwise they are emitted at
this interval, which lowers resource usage under high load.
format: int32
minimum: 0
type: integer
kubernetesMode:
description: |-
If enabled, it will automatically put pod_id, pod_name, namespace_name, docker_id and container_name
Expand Down
15 changes: 15 additions & 0 deletions config/crd/bases/fluentbit.fluent.io_clusterfilters.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -366,6 +366,21 @@ spec:
items:
type: string
type: array
flushIntervalNsec:
description: The interval for metrics emission, in nanoseconds.
Works together with flushIntervalSec.
format: int32
maximum: 999999999
minimum: 0
type: integer
flushIntervalSec:
description: |-
The interval for metrics emission, in seconds. If flushIntervalSec and flushIntervalNsec are both
unset or 0, metrics are emitted right after each filter match. Otherwise they are emitted at
this interval, which lowers resource usage under high load.
format: int32
minimum: 0
type: integer
kubernetesMode:
description: |-
If enabled, it will automatically put pod_id, pod_name, namespace_name, docker_id and container_name
Expand Down
15 changes: 15 additions & 0 deletions config/crd/bases/fluentbit.fluent.io_filters.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -366,6 +366,21 @@ spec:
items:
type: string
type: array
flushIntervalNsec:
description: The interval for metrics emission, in nanoseconds.
Works together with flushIntervalSec.
format: int32
maximum: 999999999
minimum: 0
type: integer
flushIntervalSec:
description: |-
The interval for metrics emission, in seconds. If flushIntervalSec and flushIntervalNsec are both
unset or 0, metrics are emitted right after each filter match. Otherwise they are emitted at
this interval, which lowers resource usage under high load.
format: int32
minimum: 0
type: integer
kubernetesMode:
description: |-
If enabled, it will automatically put pod_id, pod_name, namespace_name, docker_id and container_name
Expand Down
2 changes: 2 additions & 0 deletions docs/plugins/fluentbit/filter/log_to_metrics.md
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Original file line number Diff line number Diff line change
Expand Up @@ -21,3 +21,5 @@ The Log To Metrics Filter plugin allows you to generate log-derived metrics. <br
| emitterName | Name of the emitter (advanced users) | string |
| emitterMemBufLimit | set a buffer limit to restrict memory usage of metrics emitter | string |
| discardLogs | Flag that defines if logs should be discarded after processing. This applies for all logs, no matter if they have emitted metrics or not. | *bool |
| flushIntervalSec | The interval for metrics emission, in seconds. If flushIntervalSec and flushIntervalNsec are both unset or 0, metrics are emitted right after each filter match. Otherwise they are emitted at this interval, which lowers resource usage under high load. | *int32 |
| flushIntervalNsec | The interval for metrics emission, in nanoseconds. Works together with flushIntervalSec. | *int32 |
30 changes: 30 additions & 0 deletions manifests/setup/setup.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -365,6 +365,21 @@ spec:
items:
type: string
type: array
flushIntervalNsec:
description: The interval for metrics emission, in nanoseconds.
Works together with flushIntervalSec.
format: int32
maximum: 999999999
minimum: 0
type: integer
flushIntervalSec:
description: |-
The interval for metrics emission, in seconds. If flushIntervalSec and flushIntervalNsec are both
unset or 0, metrics are emitted right after each filter match. Otherwise they are emitted at
this interval, which lowers resource usage under high load.
format: int32
minimum: 0
type: integer
kubernetesMode:
description: |-
If enabled, it will automatically put pod_id, pod_name, namespace_name, docker_id and container_name
Expand Down Expand Up @@ -16444,6 +16459,21 @@ spec:
items:
type: string
type: array
flushIntervalNsec:
description: The interval for metrics emission, in nanoseconds.
Works together with flushIntervalSec.
format: int32
maximum: 999999999
minimum: 0
type: integer
flushIntervalSec:
description: |-
The interval for metrics emission, in seconds. If flushIntervalSec and flushIntervalNsec are both
unset or 0, metrics are emitted right after each filter match. Otherwise they are emitted at
this interval, which lowers resource usage under high load.
format: int32
minimum: 0
type: integer
kubernetesMode:
description: |-
If enabled, it will automatically put pod_id, pod_name, namespace_name, docker_id and container_name
Expand Down
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