[DPE-4616] Add support for tracing with tempo-k8s (#485)

* Add support for tracing with tempo-k8s

* Update outdated charm libs + fix failing unit tests

* Fix lint warnings

* Revert rolling ops lib back to v0.5

* Update charm tracing lib to v1.7

* Update charm_tracing lib + skip tracing when running unit tests

lib/charms/data_platform_libs/v0/data_interfaces.py

@@ -331,7 +331,7 @@ def _on_topic_requested(self, event: TopicRequestedEvent):
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 36
+LIBPATCH = 37
 
 PYDEPS = ["ops>=2.0.0"]
 
@@ -658,6 +658,10 @@ def set_content(self, content: Dict[str, str]) -> None:
         if not self.meta:
             return
 
+        # DPE-4182: do not create new revision if the content stay the same
+        if content == self.get_content():
+            return
+
         if content:
             self._move_to_new_label_if_needed()
             self.meta.set_content(content)

lib/charms/operator_libs_linux/v2/snap.py

@@ -83,7 +83,7 @@
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 6
+LIBPATCH = 7
 
 
 # Regex to locate 7-bit C1 ANSI sequences
@@ -319,7 +319,10 @@ def get(self, key: Optional[str], *, typed: bool = False) -> Any:
                 Default is to return a string.
         """
         if typed:
-            config = json.loads(self._snap("get", ["-d", key]))
+            args = ["-d"]
+            if key:
+                args.append(key)
+            config = json.loads(self._snap("get", args))
             if key:
                 return config.get(key)
             return config