Simple healthcheck

Useful for Kubernetes readinessProbe and livenessProbe

src/keria/app/agenting.py

@@ -28,7 +28,7 @@
 from keri.db import dbing
 from keri.db.basing import OobiRecord
 from keria.end import ending
-from keri.help import helping, ogler
+from keri.help import helping, ogler, nowIso8601
 from keri.peer import exchanging
 from keri.vc import protocoling
 from keri.vdr import verifying
@@ -58,6 +58,7 @@ def setup(name, bran, adminPort, bootPort, base='', httpPort=None, configFile=No
     bootServerDoer = http.ServerDoer(server=bootServer)
     bootEnd = BootEnd(agency)
     bootApp.add_route("/boot", bootEnd)
+    bootApp.add_route("/health", HealthEnd())
 
     # Create Authenticater for verifying signatures on all requests
     authn = Authenticater(agency=agency)
@@ -674,6 +675,14 @@ def on_post(self, req, rep):
         rep.status = falcon.HTTP_202
 
 
+class HealthEnd:
+    """Health resource for determining that a container is live"""
+
+    def on_get(self, req, resp):
+        resp.status = falcon.HTTP_OK
+        resp.media = {"message": f"Health is okay. Time is {nowIso8601()}"}
+
+
 class KeyStateCollectionEnd:
 
     @staticmethod