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add open telemetry framework, and using it add 1 new metric (#296)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| package clusters | ||
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| import "github.com/istio-ecosystem/admiral/admiral/pkg/monitoring" | ||
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| // List all metrics part of the clusters package here | ||
| var ( | ||
| configWriterMeter = monitoring.NewMeter("config_writer") | ||
| totalConfigWriterEvents = monitoring.NewCounter( | ||
| "total_config_write_invocations", | ||
| "total number of times config writer was invoked", | ||
| monitoring.WithMeter(configWriterMeter)) | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| package monitoring | ||
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| import ( | ||
| "context" | ||
| "log" | ||
| "reflect" | ||
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| api "go.opentelemetry.io/otel/metric" | ||
| ) | ||
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| // Metric interface for abstracting the different operations | ||
| // for the various metric types provided by open telemetry | ||
| type Metric interface { | ||
| Increment(attributes api.MeasurementOption) | ||
| Name() string | ||
| } | ||
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| // NewCounter returns a new counter | ||
| func NewCounter(name, description string, opts ...Options) Metric { | ||
| o := createOptions(opts...) | ||
| return newFloat64Counter(name, description, o) | ||
| } | ||
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| type counter struct { | ||
| name string | ||
| description string | ||
| ctx context.Context | ||
| int64Counter api.Int64Counter | ||
| } | ||
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| // Increment increases the value of the counter by 1, and adds the provided attributes | ||
| func (c *counter) Increment(attributes api.MeasurementOption) { | ||
| c.int64Counter.Add(c.ctx, 1, attributes) | ||
| } | ||
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| // Name returns the name of the metric | ||
| func (c *counter) Name() string { | ||
| return c.name | ||
| } | ||
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| func newFloat64Counter(name, description string, opts *options) *counter { | ||
| ctx := context.TODO() | ||
| meter := defaultMeter | ||
| if reflect.ValueOf(opts.meter).IsValid() { | ||
| meter = opts.meter | ||
| } | ||
| int64Counter, err := meter.Int64Counter( | ||
| name, | ||
| api.WithUnit("1"), | ||
| api.WithDescription(description), | ||
| ) | ||
| if err != nil { | ||
| log.Fatalf("error creating int64 counter: %v", err) | ||
| } | ||
| return &counter{ | ||
| name: name, | ||
| description: description, | ||
| ctx: ctx, | ||
| int64Counter: int64Counter, | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| package monitoring | ||
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| import ( | ||
| "go.opentelemetry.io/otel/exporters/prometheus" | ||
| api "go.opentelemetry.io/otel/metric" | ||
| "go.opentelemetry.io/otel/sdk/metric" | ||
| ) | ||
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| var ( | ||
| meterName = "admiral_monitoring" | ||
| exporter, _ = prometheus.New() | ||
| provider = metric.NewMeterProvider(metric.WithReader(exporter)) | ||
| defaultMeter = provider.Meter(meterName) | ||
| ) | ||
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| func InitializeMonitoring() error { | ||
| return nil | ||
| } | ||
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| // Options accepts a pointer to options. It is used | ||
| // to update the options by calling an array of functions | ||
| type Options func(*options) | ||
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| // NewMeter creates a new meter which defines the metric scope | ||
| func NewMeter(meterName string) api.Meter { | ||
| return provider.Meter(meterName) | ||
| } | ||
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| // WithMeter configures the given Meter | ||
| func WithMeter(meter api.Meter) Options { | ||
| return func(opts *options) { | ||
| opts.meter = meter | ||
| } | ||
| } | ||
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| type options struct { | ||
| meter api.Meter | ||
| unit string | ||
| } | ||
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| func createOptions(opts ...Options) *options { | ||
| o := &options{} | ||
| for _, opt := range opts { | ||
| opt(o) | ||
| } | ||
| return o | ||
| } |
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