[5pt] Document feedback_daemon report contents

Document feedback_daemon report contents

Product: Tarantool
Since: all versions (except Various network statistics which is since 2.7.1 only)
Audience/target:
Root document: new page about report format, add link from https://www.tarantool.io/en/doc/latest/reference/configuration/#feedback
SME: @sergepetrenko
Peer reviewer: @

Details

The doc contains a reference to feedback daemon here, but only lists 3 fields as part of its report.
Actually, feedback daemon's report contains much more info. We need to document all these fields.
Here's a feedback daemon report:

---
- arch: x64

^^^ Architecture tarantool was built for.

  features:
    schema:
      local_spaces: 0
      functional_indices: 0
      memtx_spaces: 0
      rtree_indices: 0
      tree_indices: 0
      temporary_spaces: 0
      jsonpath_indices: 0
      hash_indices: 0
      functional_multikey_indices: 0
      sync_spaces: 0
      vinyl_spaces: 0
      bitset_indices: 0
      jsonpath_multikey_indices: 0

^^^ Various index type counters, space type counters

    on_reload_configuration_used: false

^^^ Whether function box.on_reload_configuration is specified or not.

  cluster_id: 8b6692f1-5367-4232-8cf6-6a1a7f20303f

^^^ box.info.cluster.uuid

  tarantool_version: 2.8.0-0-gefc30ccf8

^^^ tarantool version

  stats:
    net:
      SENT:
        total: 0
      CONNECTIONS:
        current: 0
        total: 0
      REQUESTS:
        current: 0
        total: 0
      RECEIVED:
        total: 0
    box:
      DELETE:
        total: 0
      SELECT:
        total: 2
      INSERT:
        total: 0
      EVAL:
        total: 0
      CALL:
        total: 0
      PREPARE:
        total: 0
      EXECUTE:
        total: 0
      REPLACE:
        total: 0
      UPSERT:
        total: 0
      AUTH:
        total: 0
      ERROR:
        total: 0
      UPDATE:
        total: 0
    time: 1610608668528804

^^^ Since version 2.7.1 only Various network statistics and total count of performed operations together with system time of report generation (implemented in https://github.com/tarantool/tarantool/issues/5589)

  os: OSX

^^^ Host os.

  options:
    replication_synchro_quorum: 1
    election_mode: off
    memtx_use_mvcc_engine: false

^^^ Various configuration options used. Currently covers box.cfg.replication_synchro_quorum,
box.cfg.election_mode, box.cfg.memtx_use_mvcc_engine

  cgroup: 

^^^ process cgroup

  server_id: b35c01d5-3587-44e4-bb90-d7ae82dd64c2

^^^ box.info.uuid

  feedback_version: 5
...

Start with the feedback section in the configuration reference at the linked Tarantool documentation URL, then review issue #5589 for the version-specific statistics context. Add a new report-format page linked from that section, documenting every field shown in the example and noting that the network and operation statistics are available since 2.7.1.