Add workers_ignore_list

Overview

When a worker unit goes off, Synapse still waits for it to be able to handle their events.

Rationale

Since is not possible to remove a specific unit in a k8s model, this configuration will allow the operator to provide a list of workers to be ignored while setting instance_map and stream_writers configuration.

So, Synapse can be available again until whatever is blocking the new units from coming back is fixed.

Juju Events Changes

Module Changes

Library Changes

Checklist

[x] The charm style guide was applied
[x] The contributing guide was applied
[x] The changes are compliant with ISD054 - Manging Charm Complexity
[x] The documentation is generated using src-docs
[ ] The documentation for charmhub is updated.
[x] The PR is tagged with appropriate label (urgent, trivial, complex)

No charmhub documentation yet.

Test coverage for d96b284c0adca65b07e986330540f8221845f6bf

Name                            Stmts   Miss Branch BrPart  Cover   Missing
---------------------------------------------------------------------------
src/actions/__init__.py             2      0      0      0   100%
src/actions/register_user.py       21      0      2      0   100%
src/actions/reset_instance.py      20      0      2      0   100%
src/admin_access_token.py           9      0      0      0   100%
src/backup.py                     175      5     24      2    96%   353-354, 423-424, 480->482, 483
src/backup_observer.py            134     16     14      0    89%   132-135, 140-143, 179-182, 211-214
src/charm.py                      335     17     86      9    94%   141->143, 146, 286-287, 315, 322, 403-407, 410-411, 439-441, 461, 491-494, 556-557
src/charm_state.py                119      1     28      1    99%   262
src/charm_types.py                 34      0     10      0   100%
src/database_client.py             57      1     12      4    93%   35, 47->exit, 69->exit, 88->98
src/database_observer.py           39      0      4      1    98%   70->72
src/exceptions.py                   3      0      0      0   100%
src/irc_bridge.py                  36      9      6      0    79%   31, 71-86
src/media_observer.py              41      4      2      1    88%   61-63, 82
src/mjolnir.py                     94      3     32      3    95%   82, 86->98, 108-112
src/observability.py               20      0      2      0   100%
src/pebble.py                     196     29     36     10    83%   123-127, 158-159, 171->exit, 182-186, 205-206, 226-227, 280->285, 299-300, 317, 319, 321, 323, 325, 332-335, 356, 524-544
src/redis_observer.py              35      3      4      0    92%   62-65
src/s3_parameters.py               22      0      4      0   100%
src/saml_observer.py               31      0      6      0   100%
src/smtp_observer.py               56      4     14      2    91%   82-86, 89, 108->113
src/synapse/__init__.py             3      0      0      0   100%
src/synapse/admin.py               19      2      2      0    90%   40-41
src/synapse/api.py                175      3     24      3    97%   176, 229, 402
src/synapse/workload.py           306     33     68     14    87%   302-303, 324-325, 403->406, 409, 424->exit, 428-429, 449-450, 490-491, 527-528, 547-549, 551, 573-574, 629, 645, 692->695, 719-720, 739, 747->749, 749->751, 756-757, 772, 792-793, 810, 819-820, 839->844, 845
src/user.py                        23      0      4      0   100%
---------------------------------------------------------------------------
TOTAL                            2005    130    386     50    92%

Static code analysis report

Working... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:01
Run started:2024-06-18 12:02:36.882275

Test results:
    No issues identified.

Code scanned:
    Total lines of code: 11053
    Total lines skipped (#nosec): 4
    Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
    Total issues (by severity):
        Undefined: 0
        Low: 0
        Medium: 0
        High: 0
    Total issues (by confidence):
        Undefined: 0
        Low: 0
        Medium: 0
        High: 0
Files skipped (0):

canonical / synapse-operator