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Export new metrics for OpenFaaS Pro scaling

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* Add service target metric
* Add service min replicas metric
* Add scale type metric

These combined allow new auto-scaling modes and parameters
for OpenFaaS Pro customers.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>
This commit is contained in:
Alex Ellis (OpenFaaS Ltd)
2022-01-24 12:11:54 +00:00
committed by Alex Ellis
parent 34735d61d0
commit d85d5e7239
23 changed files with 235 additions and 472 deletions
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30
gateway/metrics/metrics.go
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@ -16,8 +16,12 @@ type MetricOptions struct {
GatewayFunctionInvocation *prometheus.CounterVec
GatewayFunctionsHistogram *prometheus.HistogramVec
GatewayFunctionInvocationStarted *prometheus.CounterVec
ServiceReplicasGauge *prometheus.GaugeVec
ServiceMetrics *ServiceMetricOptions
ServiceReplicasGauge *prometheus.GaugeVec
ServiceMinReplicasGauge *prometheus.GaugeVec
ServiceTargetLoadGauge *prometheus.GaugeVec
ServiceMetrics *ServiceMetricOptions
}
// ServiceMetricOptions provides RED metrics
@ -62,11 +66,29 @@ func BuildMetricsOptions() MetricOptions {
prometheus.GaugeOpts{
Namespace: "gateway",
Name: "service_count",
Help: "Service replicas",
Help: "Current count of replicas for function",
},
[]string{"function_name"},
)
serviceMinReplicas := prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: "gateway",
Name: "service_min",
Help: "Minium replicas for function",
},
[]string{"function_name"},
)
serviceTargetLoad := prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: "gateway",
Name: "service_target_load",
Help: "Target load for function",
},
[]string{"function_name", "scaling_type"},
)
// For automatic monitoring and alerting (RED method)
histogram := prometheus.NewHistogramVec(prometheus.HistogramOpts{
Subsystem: "http",
@ -104,6 +126,8 @@ func BuildMetricsOptions() MetricOptions {
GatewayFunctionsHistogram: gatewayFunctionsHistogram,
GatewayFunctionInvocation: gatewayFunctionInvocation,
ServiceReplicasGauge: serviceReplicas,
ServiceMinReplicasGauge: serviceMinReplicas,
ServiceTargetLoadGauge: serviceTargetLoad,
ServiceMetrics: serviceMetricOptions,
GatewayFunctionInvocationStarted: gatewayFunctionInvocationStarted,
}