Migrate SM session metrics to mongoose_instrument

[jacekwegr]

This PR includes the following:

• Changes the way we track user sessions by switching from mongoose_metrics_probe to mongoose_instrument_probe
• Updates the tests to support these changed metrics
• Updates the documentation about changed metrics
• The metric [global, cache, unique_sessions_number] was removed because it relied on a specific metric backend and wasn't used anywhere else in the code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.65%. Comparing base (bc5c502) to head (146aa72).

Additional details and impacted files

@@                  Coverage Diff                   @@
##           feature/instrument    #4313      +/-   ##
======================================================
- Coverage               84.65%   84.65%   -0.01%     
======================================================
  Files                     556      553       -3     
  Lines                   33878    33867      -11     
======================================================
- Hits                    28681    28670      -11     
  Misses                   5197     5197              

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[chrzaszcz]

It's going in the right direction. I added a few comments.

[mongoose-im]

elasticsearch_and_cassandra_26 / elasticsearch_and_cassandra_mnesia / 146aa72
Reports root/ big
OK: 455 / Failed: 0 / User-skipped: 41 / Auto-skipped: 0

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small_tests_25 / small_tests / 146aa72
Reports root / small

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small_tests_26 / small_tests / 146aa72
Reports root / small

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small_tests_26_arm64 / small_tests / 146aa72
Reports root / small

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ldap_mnesia_25 / ldap_mnesia / 146aa72
Reports root/ big
OK: 2286 / Failed: 0 / User-skipped: 910 / Auto-skipped: 0

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dynamic_domains_pgsql_mnesia_25 / pgsql_mnesia / 146aa72
Reports root/ big
OK: 4612 / Failed: 0 / User-skipped: 106 / Auto-skipped: 0

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ldap_mnesia_26 / ldap_mnesia / 146aa72
Reports root/ big
OK: 2286 / Failed: 0 / User-skipped: 910 / Auto-skipped: 0

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dynamic_domains_mysql_redis_26 / mysql_redis / 146aa72
Reports root/ big
OK: 4579 / Failed: 0 / User-skipped: 139 / Auto-skipped: 0

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internal_mnesia_26 / internal_mnesia / 146aa72
Reports root/ big
OK: 2428 / Failed: 0 / User-skipped: 768 / Auto-skipped: 0

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dynamic_domains_pgsql_mnesia_26 / pgsql_mnesia / 146aa72
Reports root/ big
OK: 4612 / Failed: 0 / User-skipped: 106 / Auto-skipped: 0

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dynamic_domains_mssql_mnesia_26 / odbc_mssql_mnesia / 146aa72
Reports root/ big
OK: 4609 / Failed: 0 / User-skipped: 109 / Auto-skipped: 0

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mysql_redis_26 / mysql_redis / 146aa72
Reports root/ big
OK: 4985 / Failed: 0 / User-skipped: 134 / Auto-skipped: 0

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pgsql_mnesia_25 / pgsql_mnesia / 146aa72
Reports root/ big
OK: 5004 / Failed: 0 / User-skipped: 115 / Auto-skipped: 0

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pgsql_cets_26 / pgsql_cets / 146aa72
Reports root/ big
OK: 4513 / Failed: 0 / User-skipped: 176 / Auto-skipped: 0

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pgsql_mnesia_26 / pgsql_mnesia / 146aa72
Reports root/ big
OK: 5004 / Failed: 0 / User-skipped: 115 / Auto-skipped: 0

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mssql_mnesia_26 / odbc_mssql_mnesia / 146aa72
Reports root/ big
OK: 5001 / Failed: 0 / User-skipped: 118 / Auto-skipped: 0

[chrzaszcz]

Looks good 👌