fix(plugin-http): remove path from span name

[morigs]

Resolves #897.

According to otel spec:

Many REST APIs encode parameters into URI path, e.g. /api/users/123 where 123 is a user id, which creates high cardinality value space not suitable for span names. ... The approach does not work ... when instrumentation is provided by a lower-level middleware that is not aware of the specifics of how the URIs are formed. ... spans SHOULD be using conservative, low cardinality names formed from the available parameters of an HTTP request, such as "HTTP {METHOD_NAME}". Instrumentation MUST NOT default to using URI path as span name...

This PR removes pathname from span name. So span names will be like in spec: HTTP GET.
I assume that framework instrumentations will add parameterized routes to the span names (like express-plugin does).

[codecov]

Codecov Report

Merging #1466 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1466   +/-   ##
=======================================
  Coverage   93.82%   93.82%           
=======================================
  Files         154      154           
  Lines        4762     4762           
  Branches      951      951           
=======================================
  Hits         4468     4468           
  Misses        294      294           

Impacted Files	Coverage Δ
packages/opentelemetry-plugin-http/src/http.ts	97.89% <100.00%> (ø)

[obecny]

I think you have to fix the tests, thx

[dyladan]

Approving because the changes look good, but the tests must be fixed before merge.

[morigs]

I can't figure out how my change could affect coverage. Can anyone help me find what needs to be fixed?

[dyladan]

I can't figure out how my change could affect coverage. Can anyone help me find what needs to be fixed?

I would guess that all of the failures are because the span names are being asserted in the tests like here https://github.com/open-telemetry/opentelemetry-js/blob/master/packages/opentelemetry-plugin-http/test/integrations/http-enable.test.ts#L292

[obecny]

lgtm