To be able to create profiling traces for Nova, client should be
able to send special HTTP header that contains trace info.
This patch is also important to be able to make cross project
traces. (Typical case heat calls nova via python client, if
profiler is initialized in heat, nova client will add extra
header, that will be parsed by special osprofiler middleware in nova
api.)
Security considerations: trace information is signed by one of the
HMAC keys that are set in nova.conf. So only person who knows HMAC key
is able to send proper header.
oslo-spec: https://review.openstack.org/#/c/103825/
Based on: https://review.openstack.org/#/c/105089/
Co-Authored-By: Dina Belova <dbelova@mirantis.com>
Co-Authored-By: Roman Podoliaka <rpodolyaka@mirantis.com>
Co-Authored-By: Tovin Seven <vinhnt@vn.fujitsu.com>
Partially implements: blueprint osprofiler-support-in-nova
Depends-On: I82d2badc8c1fcec27c3fce7c3c20e0f3b76414f1
Change-Id: I56ce4b547230e475854994c9d2249ef90e5b656c
0fed79fd8f