See log below,
The reconcile -n -a can pick up 10000s of these types of warnings, flooding the Jenkins logging system.

Connected to client: __sdmos_sdmos-int_4_jenkins_p4_mlb-gb-mlb-pm-001
SCM Task: cleanup workspace: __sdmos_sdmos-int_4_jenkins_p4_mlb-gb-mlb-pm-001
SCM Task: reverting all pending and shelved revisions.
... [list] = revert
... rm [list] | ABANDONED
... duration: (114ms)
SCM Task: removing all non-versioned files.
... [list] = reconcile -n -a
P4JAVA: //3p_tcpip/main/source/kernel/win32/intelx86/loopbackdemo/tplpdemo.dsw - warning: cannot submit from stream //sdmos/sdmos-int client
P4JAVA: //3p_tcpip/main/source/kernel/win32/intelx86/mldetect.c - warning: cannot submit from stream //sdmos/sdmos-int client
P4JAVA: //3p_tcpip/main/source/kernel/win32/intelx86/trprint.c - warning: cannot submit from stream //sdmos/sdmos-int client
P4JAVA: //3p_tcpip/main/source/kernel/win32/intelx86/trwin32.c - warning: cannot submit from stream //sdmos/sdmos-int client
P4JAVA: //3p_tcpip/main/source/kernel/win32/intelx86/trwpcap.c - warning: cannot submit from stream //sdmos/sdmos-int client
P4JAVA: //3p_tcpip/main/source/kernel/win32/intelx86/trwuart.c - warning: cannot submit from stream //sdmos/sdmos-int client
P4JAVA: //3p_tcpip/main/source/kernel/win32/intelx86/txwin32.c - warning: cannot submit from stream //sdmos/sdmos-int client
P4JAVA: //3p_tcpip/main/source/kernel/win32/intelx86/win32demo/readme.htm - warning: cannot submit from stream //sdmos/sdmos-int client
P4JAVA: //3p_tcpip/main/source/kernel/win32/intelx86/win32demo/win32demo.dsp - warning: cannot submit from stream //sdmos/sdmos-int client
P4JAVA: //3p_tcpip/main/source/kernel/win32/intelx86/win32demo/win32demo.dsw - warning: cannot submit from stream //sdmos/sdmos-int client
P4JAVA: //3p_tcpip/main/source/kernel/win32/intelx86/win32demo/win32demo.sln - warning: cannot submit from stream //sdmos/sdmos-int client
P4JAVA: //3p_tcpip/main/source/kernel/win32/intelx86/win32demo/win32demo.vcproj - warning: cannot submit from stream //sdmos/sdmos-int client
P4JAVA: //3p_tcpip/main/source/kernel/win32/intelx86/wpcap.lib - warning: cannot submit from stream //sdmos/sdmos-int client
P4JAVA: //3p_tcpip/main/source/kernel/xilkernel/trxmk.c - warning: cannot submit from stream //sdmos/sdmos-int client
... 1000s more

We need to hide this for the user since it is not a warning but just a list of files that the code needs to delete manually.

In addition we might want to have some kind of level before we determine that reconcile is a bad choice . e.g. the user can specify if reconcile detects > 5000 files it cleans the folder and does a clean sync