Use http keep-alive for OTLP/HTTP

[mwear]

As discussed at the SIG meeting earlier today, we can improve the performance of our collector exporter by reusing http connections with http keep-alive. This strategy would apply to proto over http and json over http export formats.

[srikanthccv]

Hi @mwear, I would like to work on this.

[vmarchaud]

@lonewolf3739 Feel free to ping if you want some help !

[srikanthccv]

@vmarchaud , Thanks! I have a question regarding the value setting for header. What values should be set for timeout and max in the header. Is there any chance of reading them from env and if not available fallback to some default values?

[vmarchaud]

I think everything should be configurable from the exporter config (it should be possible to disable keep alive too). For the defaults, i believe nodejs already defaults no ?

[srikanthccv]

I think everything should be configurable from the exporter config (it should be possible to disable keep alive too)

Yes, makes sense. May we should add some env like CONNECTION_REUSE_ENABLE?

For the defaults, i believe nodejs already defaults no ?

Yes, it does.

Thank you.