Add pretty-format support to LoggingMetricPublisher

[Bennett-Lynch]

LoggingMetricPublisher provides a convenient way to emit and inspect metrics via standard logging. The default log format is concise and perhaps difficult to read when looking for particular values. For users that wish to log metrics purely for debugging purposes, we should offer a more readable and user-friendly format. This PR introduces PLAIN and PRETTY format options to LoggingMetricPublisher.

PLAIN example (default/original behavior):

Metrics published: MetricCollection(name=ApiCall, metrics=[MetricRecord(metric=MarshallingDuration, value=PT0.000202197S),
MetricRecord(metric=RetryCount, value=0), MetricRecord(metric=ApiCallSuccessful, value=true),
MetricRecord(metric=OperationName, value=HeadObject), MetricRecord(metric=ApiCallDuration, value=PT0.468369S),
MetricRecord(metric=CredentialsFetchDuration, value=PT0.000003191S), MetricRecord(metric=ServiceId, value=S3)],
children=[MetricCollection(name=ApiCallAttempt, metrics=[MetricRecord(metric=SigningDuration, value=PT0.000667268S),
MetricRecord(metric=ServiceCallDuration, value=PT0.460529977S), MetricRecord(metric=AwsExtendedRequestId,
value=jY/Co5Ge6WjRYk78kGOYQ4Z/CqUBr6pAAPZtexgOQR3Iqs3QP0OfZz3fDraQiXtmx7eXCZ4sbO0=), MetricRecord(metric=HttpStatusCode,
value=200), MetricRecord(metric=BackoffDelayDuration, value=PT0S), MetricRecord(metric=AwsRequestId, value=6SJ82R65SADHX098)],
children=[MetricCollection(name=HttpClient, metrics=[MetricRecord(metric=AvailableConcurrency, value=0),
MetricRecord(metric=LeasedConcurrency, value=0), MetricRecord(metric=ConcurrencyAcquireDuration, value=PT0.230757S),
MetricRecord(metric=PendingConcurrencyAcquires, value=0), MetricRecord(metric=MaxConcurrency, value=50),
MetricRecord(metric=HttpClientName, value=NettyNio)], children=[])])])

PRETTY example (new format option):

[18e5092e] ApiCall
[18e5092e] ┌────────────────────────────────────────┐
[18e5092e] │ MarshallingDuration=PT0.000227427S     │
[18e5092e] │ RetryCount=0                           │
[18e5092e] │ ApiCallSuccessful=true                 │
[18e5092e] │ OperationName=HeadObject               │
[18e5092e] │ ApiCallDuration=PT0.541751S            │
[18e5092e] │ CredentialsFetchDuration=PT0.00000306S │
[18e5092e] │ ServiceId=S3                           │
[18e5092e] └────────────────────────────────────────┘
[18e5092e]     ApiCallAttempt
[18e5092e]     ┌───────────────────────────────────────────────────────────────────────────────────────────────────┐
[18e5092e]     │ SigningDuration=PT0.000974924S                                                                    │
[18e5092e]     │ ServiceCallDuration=PT0.531462375S                                                                │
[18e5092e]     │ AwsExtendedRequestId=eGfwjV3mSwQZQD4YxHLswYguvhQoGcDTkr2jRvpio37a6QmhWd18C8wagC8LkBzzcnOOKoMuiXw= │
[18e5092e]     │ HttpStatusCode=200                                                                                │
[18e5092e]     │ BackoffDelayDuration=PT0S                                                                         │
[18e5092e]     │ AwsRequestId=ED46TP7NN62DDG4Q                                                                     │
[18e5092e]     └───────────────────────────────────────────────────────────────────────────────────────────────────┘
[18e5092e]         HttpClient
[18e5092e]         ┌────────────────────────────────────────┐
[18e5092e]         │ AvailableConcurrency=0                 │
[18e5092e]         │ LeasedConcurrency=0                    │
[18e5092e]         │ ConcurrencyAcquireDuration=PT0.235851S │
[18e5092e]         │ PendingConcurrencyAcquires=0           │
[18e5092e]         │ MaxConcurrency=50                      │
[18e5092e]         │ HttpClientName=NettyNio                │
[18e5092e]         └────────────────────────────────────────┘

License

• I confirm that this pull request can be released under the Apache 2 license

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