[PATCH v3 0/3] extend interactive telemetry script

[Bruce Richardson <bruce.richardson@intel.com>]

To simplify interactive telemetry script for general use, i.e. not from
other scripts, we can add two new features to it:

1. Support for FOREACH to allow gathering a set of output values across
   a list of ports or devices, e.g. ethdevs or rawdevs.
2. Support having predefined aliases in a file in the user's home
   directory to simplify the use of more complicated FOREACH commands.

Putting these together, we can create new commands such as "eth_names".

  bruce@host:$ cat ~/.dpdk_telemetry_aliases
  eth_names=FOREACH index /ethdev/list /ethdev/info,$index .name

  bruce@host:$ echo eth_names | ./usertools/dpdk-telemetry.py | jq
  [
    {
      "index": 0,
      "name": "0000:16:00.0"
    },
    {
      "index": 1,
      "name": "0000:16:00.1"
    }
  ]

---
v3: updated based on review feedback from Chengwen:
    - added arg to override alias file
    - printed one-line summary of alias count loaded
    - improved doc for "help" command
    - added "help alias" to list aliases.
v2: added third patch with "help" command giving more details on
    how to use the various commands.

Bruce Richardson (3):
  usertools/telemetry: add a FOREACH command
  usertools/telemetry: support using aliases for long commands
  usertools/telemetry: add help support

 doc/guides/howto/telemetry.rst | 106 ++++++++++++-
 usertools/dpdk-telemetry.py    | 278 ++++++++++++++++++++++++++++++++-
 2 files changed, 373 insertions(+), 11 deletions(-)

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2.53.0