Memory usage is reported with wrong PID for forked processes

[giladmaya]

Hi,

I've integrated newrelic agent into my gunicorn+flask application which uses preload hooks. All the metrics that are sent from my forked workers are sent under the PID of the main gunicorn process instead of their own id.

I believe the problem originates in here where PID is initialized when the modules are loaded on the main process, instead of getting the current PID https://github.com/newrelic/newrelic-python-agent/blob/905b82277fac1fd67940b2509333bf8ed3945bb2/newrelic/samplers/memory_usage.py#L24-L36

The values are correct and based on the current PID which is running the agent: https://github.com/newrelic/newrelic-python-agent/blob/905b82277fac1fd67940b2509333bf8ed3945bb2/newrelic/common/system_info.py#L279-L298

Can you please fix this issue? Thank you

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