[KNOX-643] Add the ability to gather and expose metrics in the gateway - ASF JIRA

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The goal would be to capture various request/response metrics in the gateway and expose them via JMX and/or REST.

Some of the requests on the dev mailing list are:

Capture TPS both at the service level as well as aggregate for the server instance.
Byte transfer counts per service and aggregate
Unsuccessful login
Successful login but overall return was HTTP 500 which indicates failure
on the cluster side. An example would be users connecting to Knox with
valid AD user/pass but which were not authorized in the cluster. This can
happen when the cluster is in secure mode but a service like Centrify has
not allowed the user into the cluster's zone.
Unsuccessful AD lookup by Knox - user doesn't exist.
Connection counts that used and didn't use an auth cookie and resulted in
an AD lookup
Current open connections
Capability to reset the aggregate counters while Knox is running.
Ability to hook into Ambari's Metric collection framework.

breaks

KNOX-784 java.lang.IllegalArgumentException: A metric named org.apache.http.conn.HttpClientConnectionManager.available-connections already exists

KNOX-921 Httpclient max connections are always set to default values

is related to

KNOX-782 Add aggregate metrics at the topology and server level

KNOX-783 Add REST API for getting metrics from Knox

KNOX-781 Add a metrics reporter for Ambari Metrics

KNOX-1618 Add dropwizard metrics-jvm support

KNOX-940 Support REST access exposing metrics

(2 is related to)