Only print the matched syslog in loganalzyer teardown check, no traceback info printed (sonic-net#17926)

What is the motivation for this PR?
To make the failed summary of teardown loganalyzer shorter and clearer. It can make the summary easy to understand and downstream failure analyzer can do analysis based on clean summaries.

The summary when a case failed in loganalzyer teardown phase:
Before change:

E               Failed: Processes "['analyze_logs--<MultiAsicSonicHost str-msn4700-02>']" failed with exit code "1"
E               Exception:
E               match: 1
E               expected_match: 0
E               expected_missing_match: 0
E
E               Match Messages:
E               2025 Apr  9 02:42:13.609855 str-msn4700-02 ERR kernel: [ 1820.284908] sxd_kernel: [error] Failed to bind BFD socket to local_addr (ip:104.0.0.74 ,port:49282) (err:-98).

E               Traceback:
E               Traceback (most recent call last):
E                 File "/var/src/sonic-mgmt_vms11-t1-4700-6_6670b1f1e72b94cbabbdfe65/tests/common/helpers/parallel.py", line 35, in run
E                   Process.run(self)
E                 File "/usr/lib/python3.8/multiprocessing/process.py", line 108, in run
E                   self._target(*self._args, **self._kwargs)
E                 File "/var/src/sonic-mgmt_vms11-t1-4700-6_6670b1f1e72b94cbabbdfe65/tests/common/helpers/parallel.py", line 245, in wrapper
E                   target(*args, **kwargs)
E                 File "/var/src/sonic-mgmt_vms11-t1-4700-6_6670b1f1e72b94cbabbdfe65/tests/common/plugins/loganalyzer/__init__.py", line 45, in analyze_logs
E                   dut_analyzer.analyze(markers[node.hostname], fail_test, store_la_logs=store_la_logs)
E                 File "/var/src/sonic-mgmt_vms11-t1-4700-6_6670b1f1e72b94cbabbdfe65/tests/common/plugins/loganalyzer/loganalyzer.py", line 409, in analyze
E                   self._verify_log(analyzer_summary)
E                 File "/var/src/sonic-mgmt_vms11-t1-4700-6_6670b1f1e72b94cbabbdfe65/tests/common/plugins/loganalyzer/loganalyzer.py", line 140, in _verify_log
E                   raise LogAnalyzerError(result_str)
E               tests.common.plugins.loganalyzer.loganalyzer.LogAnalyzerError: match: 1
E               expected_match: 0
E               expected_missing_match: 0
E
E               Match Messages:
DEBUG:tests.conftest:[log_custom_msg] item: <Function test_bfd_multihop[ipv6]>
INFO:root:Can not get Allure report URL. Please check logs
E               2025 Apr  9 02:42:13.609855 str-msn4700-02 ERR kernel: [ 1820.284908] sxd_kernel: [error] Failed to bind BFD socket to local_addr (ip:104.0.0.74 ,port:49282) (err:-98).
After change:

E               Failed: Got matched syslog in processes "analyze_logs--<MultiAsicSonicHost bjw2-can-7260-10>" exit code:"1"
E               match: 1
E               expected_match: 0
E               expected_missing_match: 0
E
E               Match Messages:
E               2025 Apr 10 08:21:06.808698 bjw2-can-7260-10 ERR admin: [ 1820.284908] sxd_kernel: [error] Failed to bind BFD socket to local_addr (ip:104.0.0.74 ,port:49282) (err:-98)
How did you do it?
Check if the failed process is analyze_log and if there is Matched Messages in the exception, if so, just print the exception. Don't need to print the traceback, it ensures the summary is shorter and clearer.

How did you verify/test it?
Run a case failed in loganalyzer teardown phase, check the summary of the failed case
Signed-off-by: Zhaohui Sun <[email protected]>
Signed-off-by: Guy Shemesh <[email protected]>

Author: ZhaohuiS

tests/common/helpers/parallel.py

@@ -211,12 +211,15 @@ def force_terminate(workers, init_result):
                 p_exception = process['exception'][0]
                 p_traceback = process['exception'][1]
                 p_exitcode = process['exit_code']
-            pt_assert(
-                False,
-                'Processes "{}" failed with exit code "{}"\nException:\n{}\nTraceback:\n{}'.format(
-                    list(failed_processes.keys()), p_exitcode, p_exception, p_traceback
+            # For analyzed matched syslog, don't need to log the traceback
+            if "analyze_logs" in process_name and "Match Messages" in str(p_exception):
+                failure_message = 'Got matched syslog in processes "{}" exit code:"{}"\n{}'.format(
+                    process_name, p_exitcode, p_exception
                 )
-            )
+            else:
+                failure_message = 'Processes "{}" failed with exit code "{}"\nException:\n{}\nTraceback:\n{}'.format(
+                    list(failed_processes.keys()), p_exitcode, p_exception, p_traceback)
+            pt_assert(False, failure_message)
 
     logger.info(
         'Completed running processes for target "{}" in {} seconds'.format(