pub struct PrometheusLayer { /* private fields */ }
layers-prometheus
only.Expand description
Add prometheus for every operation.
§Prometheus Metrics
We provide several metrics, please see the documentation of observe
module.
For a more detailed explanation of these metrics and how they are used, please refer to the Prometheus documentation.
§Examples
§Basic Usage
let registry = prometheus::default_registry();
let op = Operator::new(services::Memory::default())?
.layer(
PrometheusLayer::builder()
.register(registry)
.expect("register metrics successfully"),
)
.finish();
// Write data into object test.
op.write("test", "Hello, World!").await?;
// Read data from the object.
let bs = op.read("test").await?;
info!("content: {}", String::from_utf8_lossy(&bs.to_bytes()));
// Get object metadata.
let meta = op.stat("test").await?;
info!("meta: {:?}", meta);
// Export prometheus metrics.
let mut buffer = Vec::<u8>::new();
let encoder = prometheus::TextEncoder::new();
encoder.encode(&prometheus::gather(), &mut buffer).unwrap();
println!("## Prometheus Metrics");
println!("{}", String::from_utf8(buffer.clone()).unwrap());
§Global Instance
PrometheusLayer
needs to be registered before instantiation.
If there are multiple operators in an application that need the PrometheusLayer
, we could
instantiate it once and pass it to multiple operators. But we cannot directly call
.layer(PrometheusLayer::builder().register(®istry)?)
for different services, because
registering the same metrics multiple times to the same registry will cause register errors.
Therefore, we can provide a global instance for the PrometheusLayer
.
fn global_prometheus_layer() -> &'static PrometheusLayer {
static GLOBAL: OnceLock<PrometheusLayer> = OnceLock::new();
GLOBAL.get_or_init(|| {
PrometheusLayer::builder()
.register_default()
.expect("Failed to register with the global registry")
})
}
let op = Operator::new(services::Memory::default())?
.layer(global_prometheus_layer().clone())
.finish();
// Write data into object test.
op.write("test", "Hello, World!").await?;
// Read data from the object.
let bs = op.read("test").await?;
info!("content: {}", String::from_utf8_lossy(&bs.to_bytes()));
// Get object metadata.
let meta = op.stat("test").await?;
info!("meta: {:?}", meta);
// Export prometheus metrics.
let mut buffer = Vec::<u8>::new();
let encoder = prometheus::TextEncoder::new();
encoder.encode(&prometheus::gather(), &mut buffer).unwrap();
println!("## Prometheus Metrics");
println!("{}", String::from_utf8(buffer.clone()).unwrap());
Implementations§
Source§impl PrometheusLayer
impl PrometheusLayer
Sourcepub fn builder() -> PrometheusLayerBuilder
pub fn builder() -> PrometheusLayerBuilder
Create a PrometheusLayerBuilder
to set the configuration of metrics.
§Example
// Pick a builder and configure it.
let builder = services::Memory::default();
let registry = prometheus::default_registry();
let duration_seconds_buckets = prometheus::exponential_buckets(0.01, 2.0, 16).unwrap();
let bytes_buckets = prometheus::exponential_buckets(1.0, 2.0, 16).unwrap();
let _ = Operator::new(builder)?
.layer(
PrometheusLayer::builder()
.duration_seconds_buckets(duration_seconds_buckets)
.bytes_buckets(bytes_buckets)
.register(registry)
.expect("register metrics successfully"),
)
.finish();
Trait Implementations§
Source§impl Clone for PrometheusLayer
impl Clone for PrometheusLayer
Source§fn clone(&self) -> PrometheusLayer
fn clone(&self) -> PrometheusLayer
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for PrometheusLayer
impl Debug for PrometheusLayer
Source§impl<A: Access> Layer<A> for PrometheusLayer
impl<A: Access> Layer<A> for PrometheusLayer
Source§type LayeredAccess = MetricsAccessor<A, PrometheusInterceptor>
type LayeredAccess = MetricsAccessor<A, PrometheusInterceptor>
Source§fn layer(&self, inner: A) -> Self::LayeredAccess
fn layer(&self, inner: A) -> Self::LayeredAccess
Auto Trait Implementations§
impl Freeze for PrometheusLayer
impl !RefUnwindSafe for PrometheusLayer
impl Send for PrometheusLayer
impl Sync for PrometheusLayer
impl Unpin for PrometheusLayer
impl !UnwindSafe for PrometheusLayer
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