Implement Intake V2 protocol

[alvarolobato]

Related: elastic/apm-server#1237

• Implement ndjson.strigify
• Add specific tests for ndjson
• Provide required span count (Provide required span count #51)
• Testing on apm-server v2 branch on travis
• Review the proposal doc

[pgross41]

Is there a way to use an array instead of the ndjson format? Chrome's network tab does not know how to parse it so it's difficult to read.

[hmdhk]

Thanks for reaching out @pgross41 ,

Using ndjson allows our apm-server to read and process the payload more efficiently, it also allows agents to reduce their memory footprint by sending data as it becomes available.

Unfortunately, one of the trade-offs we had to make was readability of the payload. You can see elastic/apm-server#1237 for more information about our intake v2.

Cheers

[pgross41]

Thanks for the info @jahtalab