Basically, `akka-http` instrumenter has the responsibility to instrument
the `http.server.duration` for the Play framework application, but the
current implementation has not marked the `http.route` attribute.
ref:
8e8161cb2e/instrumentation/akka/akka-http-10.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/akkahttp/server/AkkaHttpServerAttributesGetter.java (L59)
Actually, it's hard to record that attribute by only the akka-http layer
because that library's request object doesn't hold the route
information, e.g. placeholder.
So this patch delegates that job to the `play-mvc` instrumenter and when
that has been able to get the route info, the instrumenter puts
`http.route` attribute onto `http.server.duration`.
For example, when the routes configuration of the Play is like the
following:
```
GET /foo/:bar controllers.HomeController.doSomething(bar: String)
```
and when it tries to access that API, then OTEL instruments like so:
```prometheus
http_server_duration_count{otel_scope_name="io.opentelemetry.akka-http-10.0",otel_scope_version="1.23.0-alpha-SNAPSHOT",http_flavor="1.1",http_method="GET",http_route="/foo/$bar<[^/]+>",http_scheme="http",http_status_code="200",net_host_name="localhost",net_host_port="9000"} 1.0 1676078079798
http_server_duration_sum{otel_scope_name="io.opentelemetry.akka-http-10.0",otel_scope_version="1.23.0-alpha-SNAPSHOT",http_flavor="1.1",http_method="GET",http_route="/foo/$bar<[^/]+>",http_scheme="http",http_status_code="200",net_host_name="localhost",net_host_port="9000"} 12183.558843 1676078079798
http_server_duration_bucket{otel_scope_name="io.opentelemetry.akka-http-10.0",otel_scope_version="1.23.0-alpha-SNAPSHOT",http_flavor="1.1",http_method="GET",http_route="/foo/$bar<[^/]+>",http_scheme="http",http_status_code="200",net_host_name="localhost",net_host_port="9000",le="0.0"} 0.0 1676078079798
...
http_server_duration_bucket{otel_scope_name="io.opentelemetry.akka-http-10.0",otel_scope_version="1.23.0-alpha-SNAPSHOT",http_flavor="1.1",http_method="GET",http_route="/foo/$bar<[^/]+>",http_scheme="http",http_status_code="200",net_host_name="localhost",net_host_port="9000",le="+Inf"} 1.0 1676078079798
```
Rel: #1415
---------
Signed-off-by: moznion <moznion@mail.moznion.net>
7e8d76a83b