Copyright 2018, OpenCensus Authors Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

package ochttp

import (
	
	
	
)
Deprecated: client HTTP measures.
Deprecated: Use a Count aggregation over one of the other client measures to achieve the same effect.
	ClientRequestCount = stats.Int64(
		"opencensus.io/http/client/request_count",
		"Number of HTTP requests started",
Deprecated: Use ClientSentBytes.
	ClientRequestBytes = stats.Int64(
		"opencensus.io/http/client/request_bytes",
		"HTTP request body size if set as ContentLength (uncompressed)",
Deprecated: Use ClientReceivedBytes.
	ClientResponseBytes = stats.Int64(
		"opencensus.io/http/client/response_bytes",
		"HTTP response body size (uncompressed)",
Deprecated: Use ClientRoundtripLatency.
	ClientLatency = stats.Float64(
		"opencensus.io/http/client/latency",
		"End-to-end latency",
		stats.UnitMilliseconds)
)
The following client HTTP measures are supported for use in custom views.
var (
	ClientSentBytes = stats.Int64(
		"opencensus.io/http/client/sent_bytes",
		"Total bytes sent in request body (not including headers)",
		stats.UnitBytes,
	)
	ClientReceivedBytes = stats.Int64(
		"opencensus.io/http/client/received_bytes",
		"Total bytes received in response bodies (not including headers but including error responses with bodies)",
		stats.UnitBytes,
	)
	ClientRoundtripLatency = stats.Float64(
		"opencensus.io/http/client/roundtrip_latency",
		"Time between first byte of request headers sent to last byte of response received, or terminal error",
		stats.UnitMilliseconds,
	)
)
The following server HTTP measures are supported for use in custom views:
var (
	ServerRequestCount = stats.Int64(
		"opencensus.io/http/server/request_count",
		"Number of HTTP requests started",
		stats.UnitDimensionless)
	ServerRequestBytes = stats.Int64(
		"opencensus.io/http/server/request_bytes",
		"HTTP request body size if set as ContentLength (uncompressed)",
		stats.UnitBytes)
	ServerResponseBytes = stats.Int64(
		"opencensus.io/http/server/response_bytes",
		"HTTP response body size (uncompressed)",
		stats.UnitBytes)
	ServerLatency = stats.Float64(
		"opencensus.io/http/server/latency",
		"End-to-end latency",
		stats.UnitMilliseconds)
)
The following tags are applied to stats recorded by this package. Host, Path and Method are applied to all measures. StatusCode is not applied to ClientRequestCount or ServerRequestCount, since it is recorded before the status is known.
Host is the value of the HTTP Host header. The value of this tag can be controlled by the HTTP client, so you need to watch out for potentially generating high-cardinality labels in your metrics backend if you use this tag in views.
	Host = tag.MustNewKey("http.host")
StatusCode is the numeric HTTP response status code, or "error" if a transport error occurred and no status code was read.
	StatusCode = tag.MustNewKey("http.status")
Path is the URL path (not including query string) in the request. The value of this tag can be controlled by the HTTP client, so you need to watch out for potentially generating high-cardinality labels in your metrics backend if you use this tag in views.
	Path = tag.MustNewKey("http.path")
Method is the HTTP method of the request, capitalized (GET, POST, etc.).
	Method = tag.MustNewKey("http.method")
KeyServerRoute is a low cardinality string representing the logical handler of the request. This is usually the pattern registered on the a ServeMux (or similar string).
	KeyServerRoute = tag.MustNewKey("http_server_route")
)
Client tag keys.
KeyClientMethod is the HTTP method, capitalized (i.e. GET, POST, PUT, DELETE, etc.).
KeyClientPath is the URL path (not including query string).
KeyClientStatus is the HTTP status code as an integer (e.g. 200, 404, 500.), or "error" if no response status line was received.
KeyClientHost is the value of the request Host header.
	KeyClientHost = tag.MustNewKey("http_client_host")
)
Default distributions used by views in this package.
var (
	DefaultSizeDistribution    = view.Distribution(1024, 2048, 4096, 16384, 65536, 262144, 1048576, 4194304, 16777216, 67108864, 268435456, 1073741824, 4294967296)
	DefaultLatencyDistribution = view.Distribution(1, 2, 3, 4, 5, 6, 8, 10, 13, 16, 20, 25, 30, 40, 50, 65, 80, 100, 130, 160, 200, 250, 300, 400, 500, 650, 800, 1000, 2000, 5000, 10000, 20000, 50000, 100000)
)
Package ochttp provides some convenience views for client measures. You still need to register these views for data to actually be collected.
var (
	ClientSentBytesDistribution = &view.View{
		Name:        "opencensus.io/http/client/sent_bytes",
		Measure:     ClientSentBytes,
		Aggregation: DefaultSizeDistribution,
		Description: "Total bytes sent in request body (not including headers), by HTTP method and response status",
		TagKeys:     []tag.Key{KeyClientMethod, KeyClientStatus},
	}

	ClientReceivedBytesDistribution = &view.View{
		Name:        "opencensus.io/http/client/received_bytes",
		Measure:     ClientReceivedBytes,
		Aggregation: DefaultSizeDistribution,
		Description: "Total bytes received in response bodies (not including headers but including error responses with bodies), by HTTP method and response status",
		TagKeys:     []tag.Key{KeyClientMethod, KeyClientStatus},
	}

	ClientRoundtripLatencyDistribution = &view.View{
		Name:        "opencensus.io/http/client/roundtrip_latency",
		Measure:     ClientRoundtripLatency,
		Aggregation: DefaultLatencyDistribution,
		Description: "End-to-end latency, by HTTP method and response status",
		TagKeys:     []tag.Key{KeyClientMethod, KeyClientStatus},
	}

	ClientCompletedCount = &view.View{
		Name:        "opencensus.io/http/client/completed_count",
		Measure:     ClientRoundtripLatency,
		Aggregation: view.Count(),
		Description: "Count of completed requests, by HTTP method and response status",
		TagKeys:     []tag.Key{KeyClientMethod, KeyClientStatus},
	}
)
Deprecated: Old client Views.
Deprecated: No direct replacement, but see ClientCompletedCount.
	ClientRequestCountView = &view.View{
		Name:        "opencensus.io/http/client/request_count",
		Description: "Count of HTTP requests started",
		Measure:     ClientRequestCount,
		Aggregation: view.Count(),
	}
Deprecated: Use ClientSentBytesDistribution.
	ClientRequestBytesView = &view.View{
		Name:        "opencensus.io/http/client/request_bytes",
		Description: "Size distribution of HTTP request body",
		Measure:     ClientSentBytes,
		Aggregation: DefaultSizeDistribution,
	}
Deprecated: Use ClientReceivedBytesDistribution instead.
	ClientResponseBytesView = &view.View{
		Name:        "opencensus.io/http/client/response_bytes",
		Description: "Size distribution of HTTP response body",
		Measure:     ClientReceivedBytes,
		Aggregation: DefaultSizeDistribution,
	}
Deprecated: Use ClientRoundtripLatencyDistribution instead.
	ClientLatencyView = &view.View{
		Name:        "opencensus.io/http/client/latency",
		Description: "Latency distribution of HTTP requests",
		Measure:     ClientRoundtripLatency,
		Aggregation: DefaultLatencyDistribution,
	}
Deprecated: Use ClientCompletedCount instead.
	ClientRequestCountByMethod = &view.View{
		Name:        "opencensus.io/http/client/request_count_by_method",
		Description: "Client request count by HTTP method",
		TagKeys:     []tag.Key{Method},
		Measure:     ClientSentBytes,
		Aggregation: view.Count(),
	}
Deprecated: Use ClientCompletedCount instead.
	ClientResponseCountByStatusCode = &view.View{
		Name:        "opencensus.io/http/client/response_count_by_status_code",
		Description: "Client response count by status code",
		TagKeys:     []tag.Key{StatusCode},
		Measure:     ClientRoundtripLatency,
		Aggregation: view.Count(),
	}
)
Package ochttp provides some convenience views for server measures. You still need to register these views for data to actually be collected.
var (
	ServerRequestCountView = &view.View{
		Name:        "opencensus.io/http/server/request_count",
		Description: "Count of HTTP requests started",
		Measure:     ServerRequestCount,
		Aggregation: view.Count(),
	}

	ServerRequestBytesView = &view.View{
		Name:        "opencensus.io/http/server/request_bytes",
		Description: "Size distribution of HTTP request body",
		Measure:     ServerRequestBytes,
		Aggregation: DefaultSizeDistribution,
	}

	ServerResponseBytesView = &view.View{
		Name:        "opencensus.io/http/server/response_bytes",
		Description: "Size distribution of HTTP response body",
		Measure:     ServerResponseBytes,
		Aggregation: DefaultSizeDistribution,
	}

	ServerLatencyView = &view.View{
		Name:        "opencensus.io/http/server/latency",
		Description: "Latency distribution of HTTP requests",
		Measure:     ServerLatency,
		Aggregation: DefaultLatencyDistribution,
	}

	ServerRequestCountByMethod = &view.View{
		Name:        "opencensus.io/http/server/request_count_by_method",
		Description: "Server request count by HTTP method",
		TagKeys:     []tag.Key{Method},
		Measure:     ServerRequestCount,
		Aggregation: view.Count(),
	}

	ServerResponseCountByStatusCode = &view.View{
		Name:        "opencensus.io/http/server/response_count_by_status_code",
		Description: "Server response count by status code",
		TagKeys:     []tag.Key{StatusCode},
		Measure:     ServerLatency,
		Aggregation: view.Count(),
	}
)
DefaultClientViews are the default client views provided by this package. Deprecated: No replacement. Register the views you would like individually.
var DefaultClientViews = []*view.View{
	ClientRequestCountView,
	ClientRequestBytesView,
	ClientResponseBytesView,
	ClientLatencyView,
	ClientRequestCountByMethod,
	ClientResponseCountByStatusCode,
}
DefaultServerViews are the default server views provided by this package. Deprecated: No replacement. Register the views you would like individually.
var DefaultServerViews = []*view.View{
	ServerRequestCountView,
	ServerRequestBytesView,
	ServerResponseBytesView,
	ServerLatencyView,
	ServerRequestCountByMethod,
	ServerResponseCountByStatusCode,