Intro
Metrics
Prometheus
The following figure shows the architecture of Prometheus.
Data model
<metric name>{<label name>=<label value>, ...} value
Example
api_http_requests_total{method="POST", handler="/messages"} 300
Metric types
| Types | Description | Example |
|---|---|---|
| Counters | A counter is a cumulative metric that represents a single monotonically increasing counter whose value can only increase or be reset to zero on restart. | Total requests |
| Gauges | A gauge is a metric that represents a single numerical value that can arbitrarily go up and down. | Current active requests |
| Histograms | A histogram samples observations (usually things like request durations or response sizes) and counts them in configurable buckets. It also provides a sum of all observed values. | Upstream request time |
Targets
- kuberentes-apiservers
- kubernetes-nodes
- kubernetes-nodes-cadvisor
- kubernetes-pods
- kubernetes-service-endpoints
- prometheus
Istio Standard Metrics
| Protocol | Name | Type |
|---|---|---|
| HTTP/HTTP2/gRPC | istio_requests_total |
counter |
| HTTP/HTTP2/gRPC | istio_request_duration_milliseconds |
histogram |
| HTTP/HTTP2/gRPC | istio_request_bytes |
histogram |
| HTTP/HTTP2/gRPC | istio_response_bytes |
histogram |
| HTTP/HTTP2/gRPC | istio_request_messages_total |
counter |
| HTTP/HTTP2/gRPC | istio_response_messages_total |
counter |
| TCP | istio_tcp_sent_bytes_total |
counter |
| TCP | istio_tcp_received_bytes_total |
counter |
| TCP | istio_tcp_connections_opened_total |
counter |
| TCP | istio_tcp_connections_closed_total |
counter |
Visit istio.io for details.