[Impala-ASF-CR] IMPALA-6852: Add number of fragment instances per host to query profile

["Alice Fan (Code Review)" <ge...@cloudera.org>]

Hello Bikramjeet Vig, Impala Public Jenkins, 

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/12831

to look at the new patch set (#2).

Change subject: IMPALA-6852: Add number of fragment instances per host to query profile
......................................................................

IMPALA-6852: Add number of fragment instances per host to query profile

Query profile is updated to include number of fragment instances
per host. Example from "select count (*) from functional.alltypes":
    - Per Host Number of Fragment Instances: afan-box-7060:22000(2)
      afan-box-7060:22001(1) afan-box-7060:22002(1)

Added a basic observability test to ensure that the expected section
appears in the query profile.

Change-Id: I9556d7f1d56fd5c68cc2fb60df6f745a74cd4879
---
M be/src/scheduling/scheduler.cc
M tests/query_test/test_observability.py
2 files changed, 14 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/31/12831/2
-- 
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I9556d7f1d56fd5c68cc2fb60df6f745a74cd4879
Gerrit-Change-Number: 12831
Gerrit-PatchSet: 2
Gerrit-Owner: Alice Fan <fa...@gmail.com>
Gerrit-Reviewer: Bikramjeet Vig <bi...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>