Switch charmed-etcd channel to stable

[skourta]

Overview

This pull request makes a small change to the deployment configuration by updating the charmed-etcd application to use the stable channel instead of the edge channel.

• Updated the charmed-etcd application in test-bundle-charmed-etcd.yaml to use the "3.6/stable" channel instead of "3.6/edge", ensuring more reliable and stable deployments.

Rationale

We should use charmed-etcd stable now that it is. The edge channel is for development.

Checklist

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

[mateoflorido]

@skourta We are still seeing the same issue with the stable channel: https://github.com/canonical/k8s-operator/actions/runs/19699458124/job/56453824460?pr=765

[skourta]

Yes, the issue persists. This is not a charmed-etcd issue but a potential bug in juju 3.6.12. See here for the issue opened on the lib where the issue is raised. From my investigation yesterday it only happens with juju 3.6.12. I ran your integration tests as well as our on 3.6.11 and didn't manage to reproduce.

We did handle this case on the edge channel but it is a temporary fix until we figure out the root cause.

Switching to stable is not related to this issue, but you should not be deploying the edge channel which is a dev channel for us.

[github-actions]

Test results for commit dcf171b

Test coverage for dcf171b

Name                                            Stmts   Miss Branch BrPart  Cover   Missing
-------------------------------------------------------------------------------------------
charms/worker/k8s/src/certificates.py             187    133     44      0    23%   67, 96-100, 111-119, 124-125, 130-140, 145, 150-154, 163, 175, 183-199, 204-220, 229-249, 260-264, 280-290, 299-310, 314, 323-334, 342, 346-349, 356-366, 370-375, 381-393, 406-430, 442-444, 457
charms/worker/k8s/src/charm.py                    651    279    204     33    53%   123-124, 211-212, 236-237, 247-248, 250, 264, 278-285, 308-313, 319-335, 372-375, 387, 396, 413-416, 421-423, 431-440, 463->468, 470-473, 507-508, 520->522, 527-529, 531-533, 545-559, 580, 588-594, 607-624, 640, 645-646, 656->exit, 678-694, 703-712, 724-736, 754-770, 780-795, 804-810, 822-864, 882-884, 886, 904-916, 925-952, 964-976, 986, 1028, 1031, 1040, 1050, 1053, 1063-1075, 1080-1086, 1108-1110, 1114-1117, 1128-1147, 1151-1152, 1172-1173, 1190, 1193-1194, 1200->1209, 1253-1256, 1264-1265, 1268-1269
charms/worker/k8s/src/charmed_etcd.py              47     28      8      0    35%   32-36, 46, 57, 61-63, 67-81, 90-91, 95-102
charms/worker/k8s/src/cloud_integration.py         80      3     24      3    94%   140, 149->151, 158-159
charms/worker/k8s/src/config/arg_files.py          79      0     22      2    98%   134->133, 152->150
charms/worker/k8s/src/config/bootstrap.py         145     24     54      5    78%   65-84, 158-159, 202-203, 205, 223, 252, 266->254
charms/worker/k8s/src/config/cluster.py            63      3     22     11    84%   37, 51->53, 59->61, 63->65, 66, 68, 73->75, 79->81, 85->87, 92->94, 98->100
charms/worker/k8s/src/config/extra_args.py         43      4     20      4    87%   32->27, 44, 82, 100, 116
charms/worker/k8s/src/config/option.py             20      0      8      0   100%
charms/worker/k8s/src/config/resource.py           33      7      4      1    73%   32, 57-58, 63-72
charms/worker/k8s/src/containerd.py               154     15     48     18    83%   45-48, 78->82, 82->85, 85->88, 234->236, 240->243, 243->245, 245->247, 247->250, 262, 269, 276, 327-328, 340-341, 355, 357, 359, 363
charms/worker/k8s/src/cos_integration.py           41     16      4      0    56%   82, 117-234, 238
charms/worker/k8s/src/endpoints.py                 40      1     18      1    97%   62
charms/worker/k8s/src/events/update_status.py     104     19     32      9    78%   93, 99-100, 124, 126, 142, 156-167, 173, 191, 192->194, 198
charms/worker/k8s/src/inspector.py                 62     10     24      6    79%   44-45, 74, 109, 122-123, 132, 138-143
charms/worker/k8s/src/k8s/client.py                20      4      2      1    77%   39->41, 47-48, 50-51
charms/worker/k8s/src/k8s/node.py                  34     14      4      0    53%   47-49, 52, 65-75
charms/worker/k8s/src/k8sd_api_manager.py         411     27     14      2    93%   712, 787-788, 1019, 1062-1064, 1073-1077, 1139, 1208, 1216, 1234, 1247-1248, 1309-1311, 1322-1325, 1342-1346
charms/worker/k8s/src/kube_control.py              44     32     10      0    22%   31-35, 44-90
charms/worker/k8s/src/literals.py                 114      0      0      0   100%
charms/worker/k8s/src/pki.py                       29      9      2      1    68%   35-36, 49-54, 65
charms/worker/k8s/src/protocols.py                 33      5      0      0    85%   60, 68, 76, 84, 92
charms/worker/k8s/src/reschedule.py                79      4      6      3    92%   155->158, 174-175, 191-192, 215->exit, 221->exit
charms/worker/k8s/src/snap.py                     180     16     58     11    89%   110, 188-189, 200-201, 214->207, 232-237, 291-292, 294, 297->288, 304->288, 308, 329-330
charms/worker/k8s/src/token_distributor.py        251    129     66      7    43%   112-114, 128, 182, 186, 211, 236->exit, 267, 287-288, 301-311, 332, 348-361, 407->406, 411, 415->420, 438-472, 506, 519, 529, 550-660, 679-732, 745-747
charms/worker/k8s/src/upgrade.py                  121     38     36      5    64%   81-108, 191->193, 202-205, 208-212, 219->221, 222-225, 242
charms/worker/k8s/src/utils.py                     16     16      4      0     0%   6-47
-------------------------------------------------------------------------------------------
TOTAL                                            3081    836    738    123    68%

Static code analysis report

Run started:2025-12-01 15:24:28.940319+00:00

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 6180
  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):

[github-actions]

Test results for commit dcf171b

Test coverage for dcf171b

Name                                            Stmts   Miss Branch BrPart  Cover   Missing
-------------------------------------------------------------------------------------------
charms/worker/k8s/src/certificates.py             187    133     44      0    23%   67, 96-100, 111-119, 124-125, 130-140, 145, 150-154, 163, 175, 183-199, 204-220, 229-249, 260-264, 280-290, 299-310, 314, 323-334, 342, 346-349, 356-366, 370-375, 381-393, 406-430, 442-444, 457
charms/worker/k8s/src/charm.py                    651    279    204     33    53%   123-124, 211-212, 236-237, 247-248, 250, 264, 278-285, 308-313, 319-335, 372-375, 387, 396, 413-416, 421-423, 431-440, 463->468, 470-473, 507-508, 520->522, 527-529, 531-533, 545-559, 580, 588-594, 607-624, 640, 645-646, 656->exit, 678-694, 703-712, 724-736, 754-770, 780-795, 804-810, 822-864, 882-884, 886, 904-916, 925-952, 964-976, 986, 1028, 1031, 1040, 1050, 1053, 1063-1075, 1080-1086, 1108-1110, 1114-1117, 1128-1147, 1151-1152, 1172-1173, 1190, 1193-1194, 1200->1209, 1253-1256, 1264-1265, 1268-1269
charms/worker/k8s/src/charmed_etcd.py              47     28      8      0    35%   32-36, 46, 57, 61-63, 67-81, 90-91, 95-102
charms/worker/k8s/src/cloud_integration.py         80      3     24      3    94%   140, 149->151, 158-159
charms/worker/k8s/src/config/arg_files.py          79      0     22      2    98%   134->133, 152->150
charms/worker/k8s/src/config/bootstrap.py         145     24     54      5    78%   65-84, 158-159, 202-203, 205, 223, 252, 266->254
charms/worker/k8s/src/config/cluster.py            63      3     22     11    84%   37, 51->53, 59->61, 63->65, 66, 68, 73->75, 79->81, 85->87, 92->94, 98->100
charms/worker/k8s/src/config/extra_args.py         43      4     20      4    87%   32->27, 44, 82, 100, 116
charms/worker/k8s/src/config/option.py             20      0      8      0   100%
charms/worker/k8s/src/config/resource.py           33      7      4      1    73%   32, 57-58, 63-72
charms/worker/k8s/src/containerd.py               154     15     48     18    83%   45-48, 78->82, 82->85, 85->88, 234->236, 240->243, 243->245, 245->247, 247->250, 262, 269, 276, 327-328, 340-341, 355, 357, 359, 363
charms/worker/k8s/src/cos_integration.py           41     16      4      0    56%   82, 117-234, 238
charms/worker/k8s/src/endpoints.py                 40      1     18      1    97%   62
charms/worker/k8s/src/events/update_status.py     104     19     32      9    78%   93, 99-100, 124, 126, 142, 156-167, 173, 191, 192->194, 198
charms/worker/k8s/src/inspector.py                 62     10     24      6    79%   44-45, 74, 109, 122-123, 132, 138-143
charms/worker/k8s/src/k8s/client.py                20      4      2      1    77%   39->41, 47-48, 50-51
charms/worker/k8s/src/k8s/node.py                  34     14      4      0    53%   47-49, 52, 65-75
charms/worker/k8s/src/k8sd_api_manager.py         411     27     14      2    93%   712, 787-788, 1019, 1062-1064, 1073-1077, 1139, 1208, 1216, 1234, 1247-1248, 1309-1311, 1322-1325, 1342-1346
charms/worker/k8s/src/kube_control.py              44     32     10      0    22%   31-35, 44-90
charms/worker/k8s/src/literals.py                 114      0      0      0   100%
charms/worker/k8s/src/pki.py                       29      9      2      1    68%   35-36, 49-54, 65
charms/worker/k8s/src/protocols.py                 33      5      0      0    85%   60, 68, 76, 84, 92
charms/worker/k8s/src/reschedule.py                79      4      6      3    92%   155->158, 174-175, 191-192, 215->exit, 221->exit
charms/worker/k8s/src/snap.py                     180     16     58     11    89%   110, 188-189, 200-201, 214->207, 232-237, 291-292, 294, 297->288, 304->288, 308, 329-330
charms/worker/k8s/src/token_distributor.py        251    129     66      7    43%   112-114, 128, 182, 186, 211, 236->exit, 267, 287-288, 301-311, 332, 348-361, 407->406, 411, 415->420, 438-472, 506, 519, 529, 550-660, 679-732, 745-747
charms/worker/k8s/src/upgrade.py                  121     38     36      5    64%   81-108, 191->193, 202-205, 208-212, 219->221, 222-225, 242
charms/worker/k8s/src/utils.py                     16     16      4      0     0%   6-47
-------------------------------------------------------------------------------------------
TOTAL                                            3081    836    738    123    68%

Static code analysis report

Run started:2025-12-01 15:24:31.226505+00:00

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 6180
  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):