support Elastic APM for tracing

[Wing924]

Signed-off-by: Wing924 weihe924stephen@gmail.com

• [] CHANGELOG entry if change is relevant to the end user.

Changes

• support elastic APM for tracing

Verification

• setup elastic APM server
• config env variable for APM client
• run thanos with --tracing.config 'type: ELASTIC_APM'

[Wing924]

Test failed because

# cd .; git clone https://git.apache.org/thrift.git /tmp/thanos-go/src/git.apache.org/thrift.git
Cloning into '/tmp/thanos-go/src/git.apache.org/thrift.git'...
fatal: unable to access 'https://git.apache.org/thrift.git/': Failed to connect to git.apache.org port 443: Connection timed out
package github.com/minio/minio
	imports git.apache.org/thrift.git/lib/go/thrift: exit status 128

[bwplotka]

LGTM and thank your!

Super minot nit, otherwise perfect ❤️

I restarted CI, a flake indeed.

[bwplotka]

..another multi error package to the family ;p

Nothing we can do, but just funny there are so many libs for a few lines code logic (:

[bwplotka]

Can you remove this newline and run make format? (limitation of goimports)

[bwplotka]

ditto

[Wing924]

@bwplotka I fixed the code format. please review it again.

[bwplotka]

Awesome. CI is clearly blocked we are working on the fix for: #1483

[Wing924]

@bwplotka
CI is passed. Could you tell me when will you merge or decline it?

[bwplotka]

Already approved so.. why decline? (:

Nice job, thanks!

[szediktam]

@Wing924 hi, some questions about elastic_apm config.

I setup a apm server in a k8s cluster, and conntect to elasticsearch, also show "You have correctly setup APM Server" in kibana apm.
I also set a flag in thanos-query as following:
--tracing.config=type: ELASTIC_APM config: service_name: "query-trace" service_version: "1.0.1" service_environment: "container" sample_rate: 1

But there is no apm agent in kibana. something else to do?
thanos-query is a apm agent, or a apm agent need to setup?

thanks.