feat: add prometheus exporter host and port env vars

[naseemkullah]

Signed-off-by: naseemkullah naseem@transit.app

Which problem is this PR solving?

solves #1852

Short description of the changes

Added env vars for prometheux expoter host and port. Defaults are '0.0.0.0' (all addresses) and 9464 respectively.

[codecov]

Codecov Report

Merging #1857 (8284a7e) into main (9f965b0) will increase coverage by 0.32%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##             main    #1857      +/-   ##
==========================================
+ Coverage   92.45%   92.78%   +0.32%     
==========================================
  Files         165      182      +17     
  Lines        5463     6400     +937     
  Branches     1152     1354     +202     
==========================================
+ Hits         5051     5938     +887     
- Misses        412      462      +50     

Impacted Files	Coverage Δ
...etry-exporter-prometheus/src/PrometheusExporter.ts	92.10% <92.85%> (-0.44%)	⬇️
...ges/opentelemetry-instrumentation-http/src/http.ts	94.69% <0.00%> (-0.82%)	⬇️
...es/opentelemetry-context-zone-peer-dep/src/util.ts	100.00% <0.00%> (ø)
...s/opentelemetry-instrumentation-fetch/src/fetch.ts	99.23% <0.00%> (ø)
.../opentelemetry-exporter-collector/src/transform.ts	87.85% <0.00%> (ø)
packages/opentelemetry-web/src/types.ts	100.00% <0.00%> (ø)
...ackages/opentelemetry-web/src/WebTracerProvider.ts	100.00% <0.00%> (ø)
...emetry-instrumentation-xml-http-request/src/xhr.ts	96.82% <0.00%> (ø)
...ry-exporter-collector/src/CollectorExporterBase.ts	92.45% <0.00%> (ø)
...ages/opentelemetry-exporter-collector/src/types.ts	100.00% <0.00%> (ø)
... and 11 more

[vmarchaud]

@naseemkullah FYI lint is failing

[naseemkullah]

Tests keep timing out. Anyone know why?

[Flarna]

Tests keep timing out. Anyone know why?

I tried to run the exporter-prometheus tests locally and quite of them fail and test process is not ended. I assume there is some leftover server avoiding this.

Is there anything special needed to run them local?

[naseemkullah]

Tests keep timing out. Anyone know why?

I tried to run the exporter-prometheus tests locally and quite of them fail and test process is not ended. I assume there is some leftover server avoiding this.

Is there anything special needed to run them local?

Thanks! I must have forgotten to shutdown after tests, stay tuned!

[Flarna]

The first failing test for me is should start the server by default and call the callback.
It seem this test tries to start the server using NaN as port to listen which throws. This results in an error log but the test itself then times out.

You could move the exporter.shutdown() into a afterEach block to avoid that a failing test has a leftover server.

[naseemkullah]

The first failing test for me is should start the server by default and call the callback.
It seem this test tries to start the server using NaN as port to listen which throws. This results in an error log but the test itself then times out.

You could move the exporter.shutdown() into a afterEach block to avoid that a failing test has a leftover server.

Thanks for the tip!