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Support scraping metrics from function pods for custom scaling types #1221

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merged 2 commits into from
Aug 21, 2024
Merged

Support scraping metrics from function pods for custom scaling types #1221

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8700384
Scrape metrics from functions directly
welteki Aug 14, 2024
2dfa9e7
Ceil load values for scaling in recording rule
welteki Aug 21, 2024
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56 changes: 50 additions & 6 deletions chart/openfaas/templates/prometheus-pro-cfg.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -72,9 +72,7 @@ data:
namespaces:
names:
- {{ .Release.Namespace }}
{{- if ne $functionNs (.Release.Namespace | toString) }}
- {{ $functionNs }}
{{- end }}

relabel_configs:
- action: labelmap
regex: __meta_kubernetes_pod_label_(.+)
Expand Down Expand Up @@ -143,23 +141,69 @@ data:
regex: '(.*);(.*)'
replacement: '${1}.${2}'
target_label: "function_name"

- job_name: 'openfaas-function-pods'
scrape_interval: 15s
kubernetes_sd_configs:
- role: pod
# TODO: Insert namespace for role
{{- if not .Values.clusterRole }}
namespaces:
names: [ {{ $functionNs | quote }} ]
{{- end }}
relabel_configs:
# Only keep OpenFaaS function pods
- source_labels: [__meta_kubernetes_pod_labelpresent_faas_function]
action: keep
regex: true
- source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
action: keep
regex: true
- source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
action: replace
regex: ([^:]+)(?::\d+)?;(\d+)
replacement: $1:$2
target_label: __address__
- action: replace
regex: (.+)
source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
target_label: __metrics_path__
- source_labels: [__meta_kubernetes_namespace]
action: replace
target_label: kubernetes_namespacev
- source_labels: [__meta_kubernetes_pod_name]
action: replace
target_label: kubernetes_pod_name
- action: replace
source_labels:
- kubernetes_pod_name
regex: '^([0-9a-zA-Z-]+)+(-[0-9a-zA-Z]+-[0-9a-zA-Z]+)$'
replacement: '$1'
target_label: deployment_name

metric_relabel_configs:
- source_labels: [deployment_name, kubernetes_namespace]
separator: ";"
regex: '(.*);(.*)'
replacement: '${1}.${2}'
target_label: "function_name"

prometheus-rules.yml: |
groups:
- name: load
rules:
- record: job:function_current_load:sum
expr: sum by (function_name) ( rate( gateway_function_invocation_total{}[30s] ) ) and avg by (function_name) (gateway_service_target_load{scaling_type="rps"}) > 1
expr: ceil(sum by (function_name) ( rate( gateway_function_invocation_total{}[30s] ) ) and avg by (function_name) (gateway_service_target_load{scaling_type="rps"}) > 1)
labels:
scaling_type: rps

- record: job:function_current_load:sum
expr: sum by (function_name) ( max_over_time( gateway_function_invocation_inflight[45s:5s])) and on (function_name) avg by(function_name) (gateway_service_target_load{scaling_type="capacity"}) > bool 1
expr: ceil(sum by (function_name) ( max_over_time( gateway_function_invocation_inflight[45s:5s])) and on (function_name) avg by(function_name) (gateway_service_target_load{scaling_type="capacity"}) > bool 1)
labels:
scaling_type: capacity

- record: job:function_current_load:sum
expr: sum(irate ( pod_cpu_usage_seconds_total{}[1m])*1000) by (function_name) * on (function_name) avg by (function_name) (gateway_service_target_load{scaling_type="cpu"} > bool 1 )
expr: ceil(sum(irate ( pod_cpu_usage_seconds_total{}[1m])*1000) by (function_name) * on (function_name) avg by (function_name) (gateway_service_target_load{scaling_type="cpu"} > bool 1 ))
labels:
scaling_type: cpu

Expand Down