Service client metrics - AWS SDK for Java 2.x
Metrics collected with each requestMetrics collected for each request attempt

Service client metrics

With the AWS SDK for Java 2.x, you can collect metrics from the service clients in your application and then publish (output) those metrics to Amazon CloudWatch.

These tables list the metrics that you can collect and any HTTP client usage requirement.

For more information about enabling and configuring metrics for the SDK, see Enabling SDK metrics.

Metrics collected with each request

Metric name Description Type

ApiCallDuration

The total time taken to finish a request (inclusive of all retries).

Duration*

ApiCallSuccessful

True if the API call was successful; false if not.

Boolean

CredentialsFetchDuration

The time taken to fetch AWS signing credentials for the request.

Duration*
EndpointResolveDuration The duration of time it took to resolve the endpoint used for the API call. Duration*

MarshallingDuration

The time it takes to marshall an SDK request to an HTTP request.

Duration*

OperationName

The name of the AWS API the request is made to.

String

RetryCount

Number of times the SDK retried the API call.

Integer

ServiceId

Service ID of the AWS service that the API request is made against.

String

TokenFetchDuration

 The time taken to fetch token signing credentials for the request. Duration*

*java.time.Duration.

Metrics collected for each request attempt

Each API call might require multiple attempts before a response is received. These metrics are collected for each attempt.

Core metrics

Metric name Description Type

AwsExtendedRequestId

The extended request ID of the service request.

String

AwsRequestId

The request ID of the service request.

String

BackoffDelayDuration

The duration of time the SDK waited before this API call attempt.

Duration*
ErrorType The type of error that occurred for a call attempt. String
ReadThroughput The read throughput of the client in bytes/second. Double

ServiceCallDuration

The time it takes to connect to the service, send the request, and receive the HTTP status code and header from the response.

Duration*

SigningDuration

The time it takes to sign the HTTP request.

Duration*
TimeToFirstByte Elapsed time from sending the HTTP request (including acquiring a connection) to receiving the first byte of the headers in the response. Duration*
TimeToLastByte Elapsed time from sending the HTTP request (including acquiring a connection) to receiving the last byte of the response. Duration*

UnmarshallingDuration

The time it takes to unmarshall an HTTP response to an SDK response.

Duration*

*java.time.Duration.

HTTP Metrics

Metric name Description Type HTTP client required*

AvailableConcurrency

The number of remaining concurrent requests that can be supported by the HTTP client without needing to establish another connection.

Integer

 Apache, Netty, CRT

ConcurrencyAcquireDuration

The time taken to acquire a channel from the connection pool.

Duration*

Apache, Netty, CRT

HttpClientName

The name of the HTTP being use for the request.

String

Apache, Netty, CRT

HttpStatusCode

The status code returned with the HTTP response.

Integer

Any

LeasedConcurrency

The number of request currently being executed by the HTTP client.

Integer

Apache, Netty, CRT

LocalStreamWindowSize

The local HTTP/2 window size in bytes for the stream that this request was executed on.

Integer

Netty

MaxConcurrency

The max number of concurrent requests supported by the HTTP client.

Integer

Apache, Netty, CRT

PendingConcurrencyAcquires

The number of requests that are blocked, waiting for another TCP connection or a new stream to be available from the connection pool.

Integer

Apache, Netty, CRT

RemoteStreamWindowSize

The remote HTTP/2 window size in bytes for the stream that this request was executed on.

Integer

Netty

*java.time.Duration.

The terms used in the column mean: