diff --git a/bitbake/lib/bb/__init__.py b/bitbake/lib/bb/__init__.py
index e01b8d5256..269f65edce 100644
--- a/bitbake/lib/bb/__init__.py
+++ b/bitbake/lib/bb/__init__.py
@@ -71,6 +71,13 @@ class BBLoggerMixin(object):
     def verbnote(self, msg, *args, **kwargs):
         return self.log(logging.INFO + 2, msg, *args, **kwargs)
 
+    def warnonce(self, msg, *args, **kwargs):
+        return self.log(logging.WARNING - 1, msg, *args, **kwargs)
+
+    def erroronce(self, msg, *args, **kwargs):
+        return self.log(logging.ERROR - 1, msg, *args, **kwargs)
+
+
 Logger = logging.getLoggerClass()
 class BBLogger(Logger, BBLoggerMixin):
     def __init__(self, name, *args, **kwargs):
@@ -157,9 +164,15 @@ def verbnote(*args):
 def warn(*args):
     mainlogger.warning(''.join(args))
 
+def warnonce(*args):
+    mainlogger.warnonce(''.join(args))
+
 def error(*args, **kwargs):
     mainlogger.error(''.join(args), extra=kwargs)
 
+def erroronce(*args):
+    mainlogger.erroronce(''.join(args))
+
 def fatal(*args, **kwargs):
     mainlogger.critical(''.join(args), extra=kwargs)
     raise BBHandledException()
diff --git a/bitbake/lib/bb/msg.py b/bitbake/lib/bb/msg.py
index 291b38ff7f..512ec1f5c1 100644
--- a/bitbake/lib/bb/msg.py
+++ b/bitbake/lib/bb/msg.py
@@ -30,7 +30,9 @@ class BBLogFormatter(logging.Formatter):
     PLAIN = logging.INFO + 1
     VERBNOTE = logging.INFO + 2
     ERROR = logging.ERROR
+    ERRORONCE = logging.ERROR - 1
     WARNING = logging.WARNING
+    WARNONCE = logging.WARNING - 1
     CRITICAL = logging.CRITICAL
 
     levelnames = {
@@ -42,7 +44,9 @@ class BBLogFormatter(logging.Formatter):
         PLAIN  : '',
         VERBNOTE: 'NOTE',
         WARNING : 'WARNING',
+        WARNONCE : 'WARNING',
         ERROR   : 'ERROR',
+        ERRORONCE   : 'ERROR',
         CRITICAL: 'ERROR',
     }
 
@@ -58,7 +62,9 @@ class BBLogFormatter(logging.Formatter):
         PLAIN   : BASECOLOR,
         VERBNOTE: BASECOLOR,
         WARNING : YELLOW,
+        WARNONCE : YELLOW,
         ERROR   : RED,
+        ERRORONCE : RED,
         CRITICAL: RED,
     }
 
@@ -121,6 +127,23 @@ class BBLogFilter(object):
             return True
         return False
 
+class LogFilterShowOnce(logging.Filter):
+    def __init__(self):
+        self.seen_warnings = set()
+        self.seen_errors = set()
+
+    def filter(self, record):
+        msg = record.msg
+        if record.levelno == bb.msg.BBLogFormatter.WARNONCE:
+            if record.msg in self.seen_warnings:
+                return False
+            self.seen_warnings.add(record.msg)
+        if record.levelno == bb.msg.BBLogFormatter.ERRORONCE:
+            if record.msg in self.seen_errors:
+                return False
+            self.seen_errors.add(record.msg)
+        return True
+
 class LogFilterGEQLevel(logging.Filter):
     def __init__(self, level):
         self.strlevel = str(level)
@@ -293,10 +316,17 @@ def setLoggingConfig(defaultconfig, userconfigfile=None):
 
     # Convert all level parameters to integers in case users want to use the
     # bitbake defined level names
-    for h in logconfig["handlers"].values():
+    for name, h in logconfig["handlers"].items():
         if "level" in h:
             h["level"] = bb.msg.stringToLevel(h["level"])
 
+        # Every handler needs its own instance of the once filter.
+        once_filter_name = name + ".showonceFilter"
+        logconfig.setdefault("filters", {})[once_filter_name] = {
+            "()": "bb.msg.LogFilterShowOnce",
+        }
+        h.setdefault("filters", []).append(once_filter_name)
+
     for l in logconfig["loggers"].values():
         if "level" in l:
             l["level"] = bb.msg.stringToLevel(l["level"])
diff --git a/bitbake/lib/bb/ui/knotty.py b/bitbake/lib/bb/ui/knotty.py
index 484545a684..8b98da1771 100644
--- a/bitbake/lib/bb/ui/knotty.py
+++ b/bitbake/lib/bb/ui/knotty.py
@@ -647,7 +647,7 @@ def main(server, eventHandler, params, tf = TerminalFilter):
             if isinstance(event, logging.LogRecord):
                 lastprint = time.time()
                 printinterval = 5000
-                if event.levelno >= bb.msg.BBLogFormatter.ERROR:
+                if event.levelno >= bb.msg.BBLogFormatter.ERRORONCE:
                     errors = errors + 1
                     return_value = 1
                 elif event.levelno == bb.msg.BBLogFormatter.WARNING:
@@ -661,10 +661,10 @@ def main(server, eventHandler, params, tf = TerminalFilter):
                         continue
 
                     # Prefix task messages with recipe/task
-                    if event.taskpid in helper.pidmap and event.levelno != bb.msg.BBLogFormatter.PLAIN:
+                    if event.taskpid in helper.pidmap and event.levelno not in [bb.msg.BBLogFormatter.PLAIN, bb.msg.BBLogFormatter.WARNONCE, bb.msg.BBLogFormatter.ERRORONCE]:
                         taskinfo = helper.running_tasks[helper.pidmap[event.taskpid]]
                         event.msg = taskinfo['title'] + ': ' + event.msg
-                if hasattr(event, 'fn'):
+                if hasattr(event, 'fn') and event.levelno not in [bb.msg.BBLogFormatter.WARNONCE, bb.msg.BBLogFormatter.ERRORONCE]:
                     event.msg = event.fn + ': ' + event.msg
                 logging.getLogger(event.name).handle(event)
                 continue
@@ -875,11 +875,11 @@ def main(server, eventHandler, params, tf = TerminalFilter):
             for failure in taskfailures:
                 summary += "\n  %s" % failure
         if warnings:
-            summary += pluralise("\nSummary: There was %s WARNING message shown.",
-                                 "\nSummary: There were %s WARNING messages shown.", warnings)
+            summary += pluralise("\nSummary: There was %s WARNING message.",
+                                 "\nSummary: There were %s WARNING messages.", warnings)
         if return_value and errors:
-            summary += pluralise("\nSummary: There was %s ERROR message shown, returning a non-zero exit code.",
-                                 "\nSummary: There were %s ERROR messages shown, returning a non-zero exit code.", errors)
+            summary += pluralise("\nSummary: There was %s ERROR message, returning a non-zero exit code.",
+                                 "\nSummary: There were %s ERROR messages, returning a non-zero exit code.", errors)
         if summary and params.options.quiet == 0:
             print(summary)