Logger#object_filter: restrict Logger to messages referring to specific objects #9844

Al2Klimov · 2023-08-09T12:03:22Z

fixes #7912

This is the plan

~~There's a filter saying which objects along with their children are affected by a logger: f59082d 9693663~~
Apropos, too bad children (dis)appear dynamically during parent object lifetime, but parents are static per-child, so the relationship rules point from child to parent: 1ce044c 06ea999 67fb214 d98bb31
~~(Well, static is relative, I had to tweak a few things: a3f8d84 53f881b)~~
~~Those rules are so simple that one can even understand them by just reading the individual commits – at the cost of a little infrastructure hosting them: 7914d8e~~
~~Everything's cached of course: 27413d5 2a14803~~
~~The latter makes this algorithm especially performant where filter meets family tree: 8c3bfd0~~

To do

touch every single Log#Log()🪵 caller, provide involved object(s?)

Edit

User POV

This adds the ability to do the following with every single logger type:

 object FileLogger "main-log" {
  severity = "information"
  path = LogDir + "/icinga2.log"
+ object_filter = { "HostGroup" = [ "NETWAYS" ] }
 }

All config types are supported, not just HostGroup.
Not existing objects will trigger warnings (as not matching apply rules do).
The line inserted above would cause main-log not to log messages not referring to the HostGroup NETWAYS.
This is useful for (runtime) creating a debug logger, but only for some config objects.

What does "referring" mean?

A log message refers (has to be done in the code) explicitly to either the specific object given in object_filter or any of its children as below, recursively:

All endpoints of a zone are its children
All objects in a zone are its children
All groups in a group are its children
All members of a group are its children
Additionally:

child type	attribute naming parent object
comment	host_name
comment	service_name
dependency	child_host_name
dependency	child_service_name
dependency	parent_host_name
dependency	parent_service_name
downtime	host_name
downtime	service_name
downtime	config_owner (scheduleddowntime)
notification	host_name
notification	service_name
scheduleddowntime	host_name
scheduleddowntime	service_name
service	host_name

Rationale

UX, intuitivity. Even if a user doesn't know the above table, if they include parent in object_filter, they likely expect all children to be logged as well.

Dev POV

(aka git log --oneline with comments)

Logger#object_filter

f59082d Introduce Logger#object_filter
9693663 Logger#{OnAllConfigLoaded,SetObjectFilter}(): warn on missing objects for
27413d5 Cache actual Logger#object_filter objects in Logger#m_ObjectFilterCache

The first two ones should be self-explanatory.
The third one simply looks up the strings given in object_filter (initially and on change) and caches object pointers to ease comparison later.

Relationship rules

7914d8e Introduce ObjectImpl#GetParentsAffectingLogging()

This is the base.
On its own it would only generate the exact method as named above doing nothing.
Not to be too boring it also adds a new .ti field attribute parent_affecting_logging causing the type to have a own GetParentsAffectingLogging method yielding the object named by the field.
E.g. putting parent_affecting_logging on Comment's host_name and service_name creates Comment#GetParentsAffectingLogging() which returns the comment's host and service.
Apropos:

d98bb31 parent_affecting_logging: a config object affects everything functionally depending on it
67fb214 parent_affecting_logging: a config object affects everything applied to it
06ea999 parent_affecting_logging: a group affects everything in it
1ce044c parent_affecting_logging: a zone affects everything in it

These define the What does "referring" mean? part from above.
The relationships point from child to parent simply because new children can appear, but -as in real life- one's parents always stay the same.
Due to that fact every child can look up its parents recursively once and cache the pointers for a lifetime:

2a14803 ConfigObject#OnAllConfigLoaded(): build m_AllParentsAffectingLogging cache

Just to be sure that the parents really always stay the same:

53f881b Forbid Zone#endpoints modification
a3f8d84 Disallow Downtime#config_owner modification

Putting hydrogen and oxygen together

With all the above and an object pointer in every Log🪵 instance Log#~Log() just intersects the two caches, ConfigObject#m_AllParentsAffectingLogging and Logger#m_ObjectFilterCache, and passes the message through if successful.

Al2Klimov · 2023-08-09T16:19:39Z

lib/base/logger.hpp

-	Log(LogSeverity severity, String facility, const String& message);
-	Log(LogSeverity severity, String facility);
+	Log(LogSeverity severity, String facility, const String& message, const std::vector<ConfigObject::Ptr>& involved = {});
+	Log(LogSeverity severity, String facility, const std::vector<ConfigObject::Ptr>& involved = {});


I mean if you're building something that's useful and reusable anyways, make it a PR and we can look at it.

Any thoughts before I adjust every single caller?

julianbrost · 2023-08-10T08:50:13Z

lib/base/logger.cpp

+Log::Log(LogSeverity severity, String facility, const std::vector<ConfigObject::Ptr>& involved)
+	: m_Severity(severity), m_Facility(std::move(facility))
+{
+	std::set<ConfigObject::Ptr> objects;
+
+	for (auto& obj : involved) {
+		objects.merge(DependencyGraph::GetAllParents(obj));
+	}
+
+	objects.insert(involved.begin(), involved.end());
+
+	for (auto& obj : objects) {
+		auto severity (obj->GetOverrideSeverityRaw());
+
+		if (severity >= 0 && severity < m_OverriddenMinSeverity) {
+			m_OverriddenMinSeverity = (LogSeverity)severity;
+		}
+	}
+
+	m_IsNoOp = severity < std::min(Logger::GetMinLogSeverity(), m_OverriddenMinSeverity);
+}


This looks really expensive to do for every single debug log message that's probably going to be discarded in the end.

What I think could work better: pass only a single object to Log() and only compare a single attribute of that object. That attribute would store the combined log severity of that object, i.e. the minimal severity configured on that object or any of its parents. It would be updated when the severity is set, not used, i.e. put the runtime overhead there instead of when log messages are generated. That would also mean that there would only be runtime overhead if that feature is actually used.

(FYI: I haven't put much time into thinking about whether DependencyGraph actually stores a relation that's useful for this use-case or if it might include too much or too little.)

Al2Klimov · 2023-08-10T09:10:03Z

lib/base/dependencygraph.cpp

+	std::set<ConfigObject::Ptr> objects;
+	std::unordered_set<ConfigObject *> toDo {child.get()};
+	std::shared_lock<std::shared_mutex> lock (m_Mutex);
+
+	do {
+		auto current (*toDo.begin());
+
+		toDo.erase(toDo.begin());
+
+		auto it (m_Dependencies.find(current));
+
+		if (it != m_Dependencies.end()) {
+			for (auto& kv : it->second) {
+				if (objects.emplace(kv.first).second) {
+					toDo.emplace(kv.first);
+				}
+			}
+		}
+	} while (!toDo.empty());


That attribute would store the combined log severity of that object, i.e. the minimal severity configured on that object or any of its parents. It would be updated when the severity is set, not used

Too bad relationships are runtime malleable, see e.g. dependencies.

(FYI: I haven't put much time into thinking about whether DependencyGraph actually stores a relation that's useful for this use-case or if it might include too much or too little.)

Now as you talk about relationships being "useful for this use-case" I should come out with a thought I had while building this:

This feature doesn't use the DependencyGraph. Instead ConfigObject provides a new virtual method for returning wisely chosen (not checkables across dependencies of course) immediate parents (host for service, checkable for downtime, ...). As it wouldn't include runtime-dynamic parents (checkables across dependencies) and due to #9407, objects could run the algorithm shown above once on creation and RAM-cache the result set.

Too bad relationships are runtime malleable, see e.g. dependencies.

That doesn't make it impossible, just more complicated as those values might need to be updated.

Anyways, how important are the exact details here? Wouldn't this already be useful if there was no cross-object magic at all? You wouldn't get a convenient "everything for that host" switch, but that still sounds useful to me. If I want debug logging for a host, do I even automatically also want debug logging for every service on that host?

If I want debug logging for a host, do I even automatically also want debug logging for every service on that host?

IMAO yes. Especially I want all downtimes and notifications of a service, don't I? And maybe even all hostgroup members.

IMAO yes. Especially I want all downtimes and notifications of a service, don't I?

That would also be possible if we said something like "you can only filter on checkables". Each log message would be tagged with the checkable and this would simply be compared in the filter.

If that turns out to be too unflexible, maybe something like you suggested could be an option:

Instead ConfigObject provides a new virtual method for returning wisely chosen (not checkables across dependencies of course) immediate parents (host for service, checkable for downtime, ...).

But this should be bounded to a low number of objects, maybe like the object itself, a service, and a host at most.

And maybe even all hostgroup members.

In which case? If you specify a host group in the filter? Or any objects that share a host group?

But this should be bounded to a low number of objects, maybe like the object itself, a service, and a host at most.

Why? For performance reasons per log message? Please ignore them for a moment, I'll handle the performance in general soon.

Instead please have a look at the "parent_affecting_logging" commits from the UX perspective. I.e. user enables verbose logging for X -> Y, Z are affected -> OK?

But this should be bounded to a low number of objects, maybe like the object itself, a service, and a host at most.

Why? For performance reasons per log message? Please ignore them for a moment, I'll handle the performance in general soon.

Basically yes, as that would bound the per-message overhead to something like three set lookups.

Instead please have a look at the "parent_affecting_logging" commits from the UX perspective. I.e. user enables verbose logging for X -> Y, Z are affected -> OK?

I don't really understand the direction this PR is moving towards, but my feeling is that it is becoming more complex than anyone needs or asked for.

Currently, you are just pushing code with little explanation, so please explain in more detail what you're doing and why you're doing that way, including why you think this complexity is necessary.

Admittedly you're right, I'm fixing the OP...

Instead please have a look at the "parent_affecting_logging" commits from the UX perspective. I.e. user enables verbose logging for X -> Y, Z are affected -> OK?

I don't really understand the direction this PR is moving towards, but my feeling is that it is becoming more complex than anyone needs or asked for.

Currently, you are just pushing code with little explanation, so please explain in more detail what you're doing and why you're doing that way, including why you think this complexity is necessary.

"necessary" is relative. I mean, I could omit the family tree at all. But then runtime-dynamic things like downtimes and comments wouldn't be auto-included along with their checkable, not to mention scheduled downtimes. Allowing just such edge cases would put up questions like but why can't I enable a hostgroup and all hosts are affected? Now you can. You don't have to, but you can.

Just read 1ce044c 06ea999 67fb214 d98bb31, but mirror it from the user perspective and imagine some recursion on top. E.g. a hostgroup specified in the logger filter implies also its hosts (06ea999), their services (67fb214) and the latter's downtimes (d98bb31).

PS: Yes, I know it doesn't compile yet, but Log#Log() callers are missing anyway.

Al2Klimov · 2023-08-10T09:11:07Z

lib/base/logger.cpp

+	for (auto& obj : objects) {
+		auto severity (obj->GetOverrideSeverityRaw());
+
+		if (severity >= 0 && severity < m_OverriddenMinSeverity) {
+			m_OverriddenMinSeverity = (LogSeverity)severity;
+		}
+	}
+
+	m_IsNoOp = severity < std::min(Logger::GetMinLogSeverity(), m_OverriddenMinSeverity);


This loop would still exist.

Why/where do you need to pass multiple objects?

This loop would still exist.

Not for multiple objects. For an object's multiple parents.

Then I don't quite understand why the parameter is const std::vector<ConfigObject::Ptr>& involved is at the moment (i.e. a vector instead of a single pointer). Looks like you want to specify multiple objects (where with the current code, the parents for each one would be looked up). Is there a situation where this is necessary (or at least useful)?

I didn't examine a single caller yet, not to mention all of them. If it turns out that no log message immediately involves multiple not necessarily related objects, I'll omit the vector.

Al2Klimov · 2023-08-10T09:12:16Z

lib/base/logger.cpp

+	std::set<ConfigObject::Ptr> objects;
+
+	for (auto& obj : involved) {
+		objects.merge(DependencyGraph::GetAllParents(obj));
+	}
+
+	objects.insert(involved.begin(), involved.end());


But it would iterate an existing small set, not a computed one like this.

What do you think?

julianbrost · 2023-08-10T15:38:48Z

In general, the overhead per Log() should be as minimal as possible, everything non-trivial should get some performance evaluation.

Another question came to my mind where the answer might also help to reduce that overhead: if you configured that you want more verbose logging for some object, where will these messages be logged? If you have a logger writing only severity critical to syslog and another logger for a more verbose file, you certainly don't want to spam debug logging for a specific object to syslog. So there should probably be some configuration for where these messages go and if that's not configured, all that logic in the Log class could be short-circuited by a very simple check. That would at least ensure that there is almost no impact if that feature isn't used at all (that shouldn't serve as an excuse that it can arbitrarily expensive otherwise, even if it's used, it should only cause reasonable overhead).

Al2Klimov · 2023-08-11T12:07:48Z

Almost done #7912 (comment), any concerns already?

julianbrost · 2023-08-11T13:05:36Z

lib/base/logger.cpp

+		if (filter) {
+			if (!m_Involved) {
+				continue;
+			}
+
+			auto indirect (DependencyGraph::GetAllParents({m_Involved}));
+
+			indirect.emplace(m_Involved);
+
+			// TODO(ak): do something useful here
+			for (auto& object : indirect) {
+			}
+
+			ObjectLock lock (filter);
+
+			for (auto& kv : filter) {
+				auto type (Type::GetByName(kv.first));
+			}
+		}


It will boil down to what exactly will happen here in the end as it doesn't look very finished so far.

I still see the call to DependencyGraph::GetAllParents() here critical. As it's inside if (filter) { it isn't terrible, but it isn't exactly great either. I'd probably prefer a variant that wouldn't need that for every message.

I still see the call to DependencyGraph::GetAllParents() here critical. As it's inside if (filter) { it isn't terrible, but it isn't exactly great either. I'd probably prefer a variant that wouldn't need that for every message.

Despite how I've already optimised that data structure? If yes, this leads us back to the unfinished discussion above: #9844 (comment)

Looking at the new version of Log::~Log() you've just pushed, what you're doing there is far from being (almost) free: walking a graph, creating and deleting multiple sets and vector, obtaining multiple locks. If we want to do this, this needs some performance testing, I wouldn't want to merge this without knowing the impact. I mean this feature is intended for installations where there are so many log messages that you want to filter them. so if there is a high cost per message, this will add up.

julianbrost · 2023-08-11T13:07:04Z

lib/base/dependencygraph.cpp

+	std::set<Object::Ptr> objects, toDo (children.begin(), children.end());
+	std::shared_lock<std::shared_mutex> lock (m_Mutex);
+
+	do {
+		auto current (*toDo.begin());


This assumes that children is never empty. Just using a regular while (!toDo.empty()) loop would also just handle that case correctly.

… for

This attribute is used only by ScheduledDowntime anyway and is a relation declarator such as host_name, service_name.

The cluster tree can't be runtime-altered anyway.

…to it See the currently supported apply rules.

…ally depending on it

…cache recursively from ConfigObject#GetParentsAffectingLogging().

…gObject#m_AllParentsAffectingLogging If Logger#object_filter is set, but doesn't intersect with ConfigObject#m_AllParentsAffectingLogging, drop the message.

julianbrost · 2023-08-15T13:10:58Z

Please improve the PR title and description. It should be a mostly self-contained summary of what this change does (or will do if it's not finished yet) rather than a collection of links to the commits where one has to piece together the information.

A good description should at least provide:

Examples of the newly allowed configuration including an explanation what it does (this would also be a great place to provide different examples that show how your new "logging parent" relation works and why it makes sense that way).
High level overview of the implementation, something on the level "The Logger base class stores a set of object pointers (initialized once on logger creation from the strings provided in the new filter_objects config option), every Log message is now additionally additionally tagged with an object pointer. If the logger has a filter set and a log message stores a non-null pointer, it will only be logged if it's contained in the logger's allowed set, otherwise (i.e. unfiltered logger or untagged message) the message is processed as before." (this explanation is a work of fiction, any similarities to the current or future states of this PR are purely coincidental).

julianbrost

FYI: information that I would have found useful in the description which I still had to extract from the code myself:

When the all the config has been loaded, the "logging parent graph" (that's the graph formed from all the config objects and the edges returned by that new GetParentsAffectingLogging() function) is searched for all (indirect) parents of that object. The result is stored as a std::set<ConfigObject*> in every object.
For each logger, if the new object_filter attribute is set, the following happens (either when all config is loaded or the attribute is updated at runtime): resolve all object names given in this attribute to pointers and store the results in a sorted std::vector<ConfigObject*>.
For each log message and logger, these two structures are checked for common elements using std::set_intersection() to check if the message should actually be logged.

julianbrost · 2023-08-16T10:17:31Z

lib/base/configobject.cpp

+	std::vector<Ptr> toDo {this};
+
+	do {
+		auto current (toDo.back());
+
+		toDo.pop_back();
+
+		if (m_AllParentsAffectingLogging.Data.emplace(current.get()).second) {
+			current->GetParentsAffectingLogging(toDo);
+		}
+	} while (!toDo.empty());


So m_AllParentsAffectingLogging.Data will contain Ptr(this), so wouldn't this prevent the object from ever being deleted?

I permanently store only raw pointers, not intrusive ones.

julianbrost · 2023-08-16T10:49:50Z

lib/base/logger.cpp

+		auto filter (logger->GetObjectFilter());
+
+		if (logger->GetObjectFilter()) {


Looks like some leftover: calling the function again after storing the result of that function in an unused variable?

Fixed it locally for now. No reason for any more GHA excesses, yet. 🙈

julianbrost · 2023-08-16T11:40:39Z

lib/base/logger.hpp

@@ -104,6 +116,9 @@ class Logger : public ObjectImpl<Logger>
 	static LogSeverity m_ConsoleLogSeverity;
 	static std::mutex m_UpdateMinLogSeverityMutex;
 	static Atomic<LogSeverity> m_MinLogSeverity;
+
+	Atomic<bool> m_CalledOnAllConfigLoaded {false};
+	std::vector<ConfigObject*> m_ObjectFilterCache;


As these are raw pointer, is there anything preventing them from becoming dangling? (For those in ConfigObject.m_AllParentsAffectingLogging.Data one might argue with that they should only be removed in a safe order, but even that should be double checked and here, I don't see anything like that.)

Nothing at all and I see no problems as they're only intersected anyway.

It looks like the behavior of that is implementation-defined (see https://stackoverflow.com/a/30694084, and even undefined in C++11) and even in the best-case scenario, this could result in some object randomly being logged if is allocated at the same address as some previous object that was included in the filter.

Apart from that, leaving dangling pointers is always dangerous, better hope nobody will ever have an idea that involves dereferencing the pointers in this vector.

Seriously, a raw pointer is just a number. Not more, not less. In Log#~Log(🪵) I'm only comparing numbers. Change my mind.

this could result in some object randomly being logged if is allocated at the same address as some previous object that was included in the filter.

Yes, in case someone who explicitly included an object in a filter removes that object. Again, explicitly. Would you feel better if I maintain an additional vector with Ptr, just for keep alive?

Apart from that, leaving dangling pointers is always dangerous, better hope nobody will ever have an idea that involves dereferencing the pointers in this vector.

DependencyGraph has the same ~~problem~~.

Seriously, a raw pointer is just a number. Not more, not less. In Log#~Log(🪵) I'm only comparing numbers. Change my mind.

That's probably what most people expect, but compilers may see an opportunity for optimization that could go wrong.

this could result in some object randomly being logged if is allocated at the same address as some previous object that was included in the filter.

Yes, in case someone who explicitly included an object in a filter removes that object. Again, explicitly. Would you feel better if I maintain an additional vector with Ptr, just for keep alive?

Which would then just prevent the object from ever being freed?

Apart from that, leaving dangling pointers is always dangerous, better hope nobody will ever have an idea that involves dereferencing the pointers in this vector.

DependencyGraph has the same ~~problem~~.

I hope it doesn't. DependencyGraph will even dereference the pointers itself in DependencyGraph::GetParents() so there better be no dangling pointers. Objects should do DependencyGraph::RemoveDependency() before they die, if they don't, it's a bug.

Seriously, a raw pointer is just a number. Not more, not less. In Log#~Log(🪵) I'm only comparing numbers. Change my mind.

That's probably what most people expect, but compilers may see an opportunity for optimization that could go wrong.

Suggestion:

I assert std::is_trivial_v on the pointer type I use.

this could result in some object randomly being logged if is allocated at the same address as some previous object that was included in the filter.

Yes, in case someone who explicitly included an object in a filter removes that object. Again, explicitly. Would you feel better if I maintain an additional vector with Ptr, just for keep alive?

Which would then just prevent the object from ever being freed?

Exactly. (Especially with my recursive relationship feature) one shouldn't list every single object in the config.

Apart from that, leaving dangling pointers is always dangerous, better hope nobody will ever have an idea that involves dereferencing the pointers in this vector.

DependencyGraph has the same ~~problem~~.

I hope it doesn't. DependencyGraph will even dereference the pointers itself in DependencyGraph::GetParents() so there better be no dangling pointers. Objects should do DependencyGraph::RemoveDependency() before they die, if they don't, it's a bug.

+1.

All in all, have I ever mentioned I'd like the classic std::shared_ptr back? We'd have std::weak_ptr which enables having not dangling, but not leaking pointers.

Suggestion:

I assert std::is_trivial_v on the pointer type I use.

Ah, nice! Pointer types are scalar types (https://en.cppreference.com/w/cpp/named_req/ScalarType) which are trivial types (https://en.cppreference.com/w/cpp/named_req/TrivialType).

compilers may see an opportunity for optimization that could go wrong.

Shall I make my just-numbers volatile then?

Al2Klimov self-assigned this Aug 9, 2023

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Object triggered verbose logging #7912

Open

Al2Klimov force-pushed the object-triggered-verbose-logging-7912 branch from 3e9b03d to 48289a4 Compare August 11, 2023 12:05

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Al2Klimov force-pushed the object-triggered-verbose-logging-7912 branch from 48289a4 to 33b1596 Compare August 11, 2023 13:27

Al2Klimov changed the title ~~Introduce ConfigObject#override_severity~~ Log#~Log(): skip messages based on Logger#object_filter and DependencyGraph Aug 11, 2023

Al2Klimov force-pushed the object-triggered-verbose-logging-7912 branch from 33b1596 to 179e4c5 Compare August 11, 2023 13:33

Al2Klimov added 2 commits August 11, 2023 17:46

Introduce Logger#object_filter

f59082d

Logger#{OnAllConfigLoaded,SetObjectFilter}(): warn on missing objects…

9693663

… for

Al2Klimov force-pushed the object-triggered-verbose-logging-7912 branch from 179e4c5 to 9eca379 Compare August 14, 2023 16:58

Al2Klimov added 6 commits August 15, 2023 11:16

Cache actual Logger#object_filter objects in Logger#m_ObjectFilterCache

27413d5

Introduce ObjectImpl<ConfigObject>#GetParentsAffectingLogging()

7914d8e

Disallow Downtime#config_owner modification

a3f8d84

This attribute is used only by ScheduledDowntime anyway and is a relation declarator such as host_name, service_name.

Forbid Zone#endpoints modification

53f881b

The cluster tree can't be runtime-altered anyway.

parent_affecting_logging: a zone affects everything in it

1ce044c

parent_affecting_logging: a group affects everything in it

06ea999

Al2Klimov added 7 commits August 15, 2023 11:16

parent_affecting_logging: a config object affects everything applied …

67fb214

…to it See the currently supported apply rules.

parent_affecting_logging: a config object affects everything function…

d98bb31

…ally depending on it

ConfigObject#OnAllConfigLoaded(): build m_AllParentsAffectingLogging …

2a14803

…cache recursively from ConfigObject#GetParentsAffectingLogging().

Merge Log#Log() methods

eb1261e

Log#Log(): require passing one involved object

73e9b52

[TODO: REVERT] Repair GHA for now

0cecad6

Log#~Log(): skip messages based on Logger#m_ObjectFilterCache & Confi…

8c3bfd0

…gObject#m_AllParentsAffectingLogging If Logger#object_filter is set, but doesn't intersect with ConfigObject#m_AllParentsAffectingLogging, drop the message.

Al2Klimov force-pushed the object-triggered-verbose-logging-7912 branch from 9eca379 to 8c3bfd0 Compare August 15, 2023 09:56

Al2Klimov changed the title ~~Log#~Log(): skip messages based on Logger#object_filter and DependencyGraph~~ Log#~Log(): skip messages based on Logger#m_ObjectFilterCache & ConfigObject#m_AllParentsAffectingLogging Aug 15, 2023

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Al2Klimov changed the title ~~Log#~Log(): skip messages based on Logger#m_ObjectFilterCache & ConfigObject#m_AllParentsAffectingLogging~~ Logger#object_filter: restrict Logger to messages referring to specific objects Aug 15, 2023

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Al2Klimov mentioned this pull request Aug 5, 2024

Fix broken runtime config sync #10013

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Introduce Endpoint#seconds_{reading_messages,awaiting_semaphore,processing_messages} #10266

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		auto filter (logger->GetObjectFilter());

		if (logger->GetObjectFilter()) {

Logger#object_filter: restrict Logger to messages referring to specific objects #9844

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Logger#object_filter: restrict Logger to messages referring to specific objects #9844

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Al2Klimov commented Aug 9, 2023 • edited Loading

This is the plan

To do

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User POV

What does "referring" mean?

Rationale

Dev POV

Logger#object_filter

Relationship rules

Putting hydrogen and oxygen together

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julianbrost commented Aug 10, 2023

Al2Klimov commented Aug 11, 2023

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julianbrost commented Aug 15, 2023

julianbrost left a comment • edited Loading

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Al2Klimov commented Aug 9, 2023 •

edited

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julianbrost left a comment •

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