> We don’t discuss your changes and your proposals for the Metric API.
You want say didn't discuss? Actually we did it [1] but you told ok let's see code :) > So I don’t think we can make the existence of some PR is an argument to > introduce(or not introduce) this facade. You definitely right in case of competition development. But I think that collaborative development is more effective. Isn't it? > Moreover, As far as I know, you developing changes for the Metric API for 5 > months without public discussion, for now. Let's start it. Firsty, with discussion. See above. Secondly, yes it took a lot of time due to a lot of changes. Is it problem? > Let’s do the following: > 1. Review `IgniteMetric` facade and introduce it to the users as an > experimental API. It just doesn't make sense. Just commit for commit. > 2. Discuss your proposal to the Metric API in the separate thread you are > referencing. You a re welcome to thread [1] again. But please, take into account. because discussion is postponed by you it's late enough to discuss proposed solution. But of course I'll answer on your questions and will be glade to your comments and suggestions. > I think we should start a discussion from the simplified explanation of: > 1. API intentions - What we want to gain with it? What is our focus? > 2. Simple, minimal example of API main interfaces and desired usages. All this already described at [1]. You also can take a look on PR (see MetricSource implementations, there are complex and simple ones). [1] http://apache-ignite-developers.2346864.n4.nabble.com/IEP-35-Metrics-management-in-Ignite-tp43243.html On Thu, Jan 23, 2020 at 5:42 PM Николай Ижиков <nizhi...@apache.org> wrote: > > Andrey. > > > IGNITE-11927 implementation so your changes are incompatible with my changes > > We don’t discuss your changes and your proposals for the Metric API. > So I don’t think we can make the existence of some PR is an argument to > introduce(or not introduce) this facade. > Moreover, As far as I know, you developing changes for the Metric API for 5 > months without public discussion, for now. Let's start it. > > Let’s do the following: > > 1. Review `IgniteMetric` facade and introduce it to the users as an > experimental API. > > 2. Discuss your proposal to the Metric API in the separate thread you are > referencing. > > I think we should start a discussion from the simplified explanation of: > > 1. API intentions - What we want to gain with it? What is our focus? > 2. Simple, minimal example of API main interfaces and desired usages. > > This will help to the community and me personally better understand your idea > and share feedback. > > Thanks. > > > 23 янв. 2020 г., в 17:15, Andrey Gura <ag...@apache.org> написал(а): > > > > Nikolay, > > > > as I wrote early in this thread API significantly changed during > > IGNITE-11927 implementation so your changes are incompatible with my > > changes. > > > > ReadOnlyMetricRegistry will be removed at all (still exists in a > > couple of places where it uses). > > > > Also I don't want to introduce IgniteMetric facade in this rush. In > > current implementation this interface just provides access to the > > ReadOnlyMetricManager instance (which will be removed) but it is not > > enough. > > > > I agree with Denis. We should mark current API as experimental and > > continue IEP-35 development. See my process proposal [1] described > > early this thread. We can release Apache Ignite 2.8.1 specially for > > this changes. > > Public APIs require deeper thinking in order to provide comprehensive, > > consistent and convenient way of metrics management for end users. > > > > Let's add IgniteExperimental, release 2.8 and finish metrics related > > issues after it. > > > > [1] > > http://apache-ignite-developers.2346864.n4.nabble.com/Internal-classes-are-exposed-in-public-API-tp45146p45185.html > > > > > > On Wed, Jan 22, 2020 at 5:21 PM Николай Ижиков <nizhi...@apache.org> wrote: > >> > >> Hello, Igniters. > >> > >> * IGNITE-12552: Move ReadOnlyMetricRegistry to public API merged to the > >> master and cherry-picked to the 2.8. > >> So the main issue with the Metric API solved. > >> > >> * I raised the PR [1] to fix second issue with the new Metric API: absence > >> of the public Java API to get metrics. > >> This PR introduces the following changes: > >> > >> 1. IgniteMetric interface created: it provides Java API to access Ignite > >> metrics created with the new Metric API. > >> > >> ``` > >> public interface IgniteMetric extends Iterable<ReadOnlyMetricRegistry> { > >> @Nullable ReadOnlyMetricRegistry registry(String name); > >> } > >> ``` > >> > >> 2. All deprecation javadocs regarding metrics now reference to the public > >> IgniteMetric instead of internal GridMetricManager: > >> > >>> @deprecated Use {@link IgniteMetric} instead. > >> > >> 3. Tests refactored to use IgniteMetric instead of GridMetricManager when > >> possible. > >> > >> Please, review. > >> > >> [1] https://github.com/apache/ignite/pull/7283 > >> > >>> 21 янв. 2020 г., в 17:51, Николай Ижиков <nizhikov....@gmail.com> > >>> написал(а): > >>> > >>> Hello, Igniters. > >>> > >>> Alexey approved my PR [1] regarding fixing public API for metric > >>> exporters. > >>> I’m waiting for a bot visa and merge this PR. > >>> > >>> As we discussed, the metrics API will be marked with IgniteExperimental > >>> annotation. > >>> > >>> If anyone has any objection to this plan, please provide your feedback. > >>> > >>> [1] https://github.com/apache/ignite/pull/7269 > >>> > >>>> 21 янв. 2020 г., в 13:45, Николай Ижиков <nizhikov....@gmail.com> > >>>> написал(а): > >>>> > >>>> Thanks, for the review Alexey. > >>>> > >>>> I will fix your comment and try to implement Monitoring facade, shortly. > >>>> > >>>>> 21 янв. 2020 г., в 13:32, Alexey Goncharuk <alexey.goncha...@gmail.com> > >>>>> написал(а): > >>>>> > >>>>> Nikolay, > >>>>> > >>>>> I left a single comment in the PR about the histogram metric. I think > >>>>> the > >>>>> API looks much cleaner now. > >>>>> > >>>>> I will take care of the @IgniteExperimental annotation. > >>>>> > >>>>> пн, 20 янв. 2020 г. в 20:55, Николай Ижиков <nizhi...@apache.org>: > >>>>> > >>>>>> Alexey. > >>>>>> > >>>>>> PR [1] is waiting for your review. > >>>>>> Please, take a look. > >>>>>> > >>>>>> I think we should do the following before 2.8 release > >>>>>> > >>>>>> * Introduce new @IgniteExperimental annotation as discussed. > >>>>>> * Mark Monitoring API with it. > >>>>>> * merge «[IEP-35] Expose MetricRegistry to the public API» to 2.8 > >>>>>> * merge «[IEP-35] public Java metric API» to 2.8 > >>>>>> > >>>>>> [1] https://github.com/apache/ignite/pull/7269 > >>>>>> > >>>>>>> 20 янв. 2020 г., в 17:09, Alexey Goncharuk > >>>>>>> <alexey.goncha...@gmail.com> > >>>>>> написал(а): > >>>>>>> > >>>>>>> Nikolay, > >>>>>>> > >>>>>>> Should we wait for both of the tickets given that we agreed that we > >>>>>>> are > >>>>>>> putting an experimental marker on the new APIs? I'm ok to fix only the > >>>>>>> first one and add the experimental marker so that we do not delay 2.8 > >>>>>>> release. > >>>>>>> > >>>>>>> пн, 20 янв. 2020 г. в 13:32, Николай Ижиков <nizhi...@apache.org>: > >>>>>>> > >>>>>>>> Andrey. > >>>>>>>> > >>>>>>>> Let’s move from the long letters to the code. > >>>>>>>> If you want to change API - please, propose this changes. > >>>>>>>> I think everybody wins if we make our API better. > >>>>>>>> > >>>>>>>> Please, describe proposed changes. > >>>>>>>> It would be great if you have some examples or PR for it. > >>>>>>>> > >>>>>>>> As for this release, I have plans to contribute tickets > >>>>>>>> «[IEP-35] Expose MetricRegistry to the public API» [1] and > >>>>>>>> «[IEP-35] public Java metric API» [2] for it. > >>>>>>>> > >>>>>>>> Any objections on it? > >>>>>>>> > >>>>>>>> [1] https://github.com/apache/ignite/pull/7269 > >>>>>>>> [2] https://issues.apache.org/jira/browse/IGNITE-12553 > >>>>>>>> > >>>>>>>> > >>>>>>>>> 20 янв. 2020 г., в 13:08, Andrey Gura <ag...@apache.org> написал(а): > >>>>>>>>> > >>>>>>>>> It solves problem. > >>>>>>>>> > >>>>>>>>> On Mon, Jan 20, 2020 at 12:09 PM Alexey Goncharuk > >>>>>>>>> <alexey.goncha...@gmail.com> wrote: > >>>>>>>>>> > >>>>>>>>>> After giving it some thought, I agree with Denis - there is nothing > >>>>>>>> wrong > >>>>>>>>>> with exposing the new APIs, we just need to make it clear that we > >>>>>>>>>> are > >>>>>>>> still > >>>>>>>>>> going to change it. > >>>>>>>>>> > >>>>>>>>>> Should we Introduce something like @IgniteExperimental annotation > >>>>>>>>>> (I > >>>>>>>>>> believe it has been discussed a dozen of times on the dev-list)? > >>>>>>>>>> > >>>>>>>>>> пт, 17 янв. 2020 г. в 23:28, Nikolay Izhikov <nizhi...@apache.org>: > >>>>>>>>>> > >>>>>>>>>>> +1 to mark feature or whole release as EA. > >>>>>>>>>>> > >>>>>>>>>>> пт, 17 янв. 2020 г., 23:00 Denis Magda <dma...@apache.org>: > >>>>>>>>>>> > >>>>>>>>>>>> Folks, if you don't mind I'll share some thoughts/suggestions as > >>>>>>>>>>>> an > >>>>>>>>>>>> observer who was not involved in the feature development. > >>>>>>>>>>>> > >>>>>>>>>>>> It's absolutely 'ok' to deprecate an API that is replaced with a > >>>>>> much > >>>>>>>>>>>> better version. However, we should do this only when the new APIs > >>>>>> are > >>>>>>>>>>>> production-ready. If there are still many limitations or open > >>>>>>>>>>>> items > >>>>>>>> then > >>>>>>>>>>>> don't deprecate anything that exists and release the new APIs > >>>>>>>> labeling as > >>>>>>>>>>>> early access. What if release the improvements labeling as EA > >>>>>> instead > >>>>>>>> of > >>>>>>>>>>>> hiding them completely? > >>>>>>>>>>>> > >>>>>>>>>>>> I would also encourage us to put aside emotions, don't blame or > >>>>>> point > >>>>>>>>>>>> fingers. This IEP is a great initiative and you both have already > >>>>>>>> done a > >>>>>>>>>>>> tremendous job by developing, architecting and reviewing changes. > >>>>>>>> Just be > >>>>>>>>>>>> respectful. Nobody is trying to block the feature from being > >>>>>> released. > >>>>>>>>>>>> Everyone would be glad to tap into improvements and start using > >>>>>>>>>>>> them > >>>>>>>> in > >>>>>>>>>>>> prod. But if more time is needed for the GA let's reiterate a > >>>>>>>>>>>> bit. > >>>>>>>>>>>> > >>>>>>>>>>>> - > >>>>>>>>>>>> Denis > >>>>>>>>>>>> > >>>>>>>>>>>> > >>>>>>>>>>>> On Fri, Jan 17, 2020 at 12:24 PM Николай Ижиков < > >>>>>> nizhi...@apache.org> > >>>>>>>>>>>> wrote: > >>>>>>>>>>>> > >>>>>>>>>>>>>> Also I agree with Alexey about introducing public > >>>>>>>>>>>>>> IgniteMonitoring > >>>>>>>>>>>> facade > >>>>>>>>>>>>> > >>>>>>>>>>>>> This is not an issue with the API. > >>>>>>>>>>>>> Just the new feature that doesn’t affects API. > >>>>>>>>>>>>> Moreover, I create a ticket to fix it, already. > >>>>>>>>>>>>> > >>>>>>>>>>>>>> It's right. But if you add checking of statisticsEnabling > >>>>>>>>>>>>>> property > >>>>>>>>>>> then > >>>>>>>>>>>>> test will fail. It's just not good tests. > >>>>>>>>>>>>> > >>>>>>>>>>>>> My changes doesn’t affect any `staticticsEnabled` property. > >>>>>>>>>>>>> I don’ understand your point here. > >>>>>>>>>>>>> > >>>>>>>>>>>>>> Redundant ReadOnlyMetricRegistry. > >>>>>>>>>>>>> > >>>>>>>>>>>>> It’s not redundant. > >>>>>>>>>>>>> It required for exporters and provide read only access to > >>>>>>>>>>> MetricRegistry > >>>>>>>>>>>>> existing in the node. > >>>>>>>>>>>>> > >>>>>>>>>>>>> > >>>>>>>>>>>>>> MetricExporterSpi that requires ReadOnlyMetricRegistry. > >>>>>>>>>>>>> > >>>>>>>>>>>>>> Absence of newly created metrics in old MBeans that forces user > >>>>>> use > >>>>>>>>>>>>>> exporter SPI while his code base uses old MBeans. > >>>>>>>>>>>>> > >>>>>>>>>>>>> Why this is issue? > >>>>>>>>>>>>> > >>>>>>>>>>>>>> Inconsistent MetricRegistry API. > >>>>>>>>>>>>> > >>>>>>>>>>>>> It’s consistent. > >>>>>>>>>>>>> > >>>>>>>>>>>>>> Metrics lookups from map instead of using direct reference > >>>>>>>>>>>>>> (performance problem). > >>>>>>>>>>>>> > >>>>>>>>>>>>> 1. We(You and I) did this choice together to simplify creation > >>>>>>>>>>>>> of > >>>>>> the > >>>>>>>>>>> new > >>>>>>>>>>>>> metrics. > >>>>>>>>>>>>> 2. This is not public API issue. > >>>>>>>>>>>>> > >>>>>>>>>>>>> > >>>>>>>>>>>>>> Ignoring of statisticsEnabled flag. > >>>>>>>>>>>>> > >>>>>>>>>>>>> I don’t ignore this flag. > >>>>>>>>>>>>> It just doesn’t exists in new framework(because of scope). > >>>>>>>>>>>>> I don’t think it’s an issue. > >>>>>>>>>>>>> > >>>>>>>>>>>>>> JmxExporterSpi creates beans that doesn't satisfy best MBeans > >>>>>>>>>>>> practices. > >>>>>>>>>>>>> > >>>>>>>>>>>>> Please, clarify your statement. > >>>>>>>>>>>>> What is best MBeans practices you are talking about? > >>>>>>>>>>>>> > >>>>>>>>>>>>>> Not finished IGNITE-11927 > >>>>>>>>>>>>> > >>>>>>>>>>>>> > >>>>>>>>>>>>> How this can be API issue? > >>>>>>>>>>>>> > >>>>>>>>>>>>> > >>>>>>>>>>>>>> 17 янв. 2020 г., в 20:52, Andrey Gura <ag...@apache.org> > >>>>>>>> написал(а): > >>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> All issues Alexey mentioned in starting letter are fixed > >>>>>>>>>>>>>>>> with my > >>>>>>>> PR > >>>>>>>>>>>>> [1]. > >>>>>>>>>>>>>>>> I don’t think other issues you mentioned are blocker for the > >>>>>>>>>>> release. > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> As I mentioned already IGNITE-11927 is part of IEP-35 and > >>>>>>>>>>>>>> implementation seriously affects API's. Also I agree with > >>>>>>>>>>>>>> Alexey > >>>>>>>>>>> about > >>>>>>>>>>>>>> introducing public IgniteMonitoring facade. So thiss PR doesn't > >>>>>> fix > >>>>>>>>>>>>>> all issues. > >>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> I talk about ignored existing functionality. > >>>>>>>>>>>>>>> There is no existing tests that was broken by this > >>>>>>>>>>>>>>> contribution. > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> It's right. But if you add checking of statisticsEnabling > >>>>>>>>>>>>>> property > >>>>>>>>>>>>>> then test will fail. It's just not good tests. > >>>>>>>>>>>>>> > >>>>>>>>>>>>>>> If you know the issues with it, feel free to create a ticket I > >>>>>> will > >>>>>>>>>>>> fix > >>>>>>>>>>>>> it ASAP. > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> I already fix it all in IGNITE-11927 > >>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> 1. Moving IEP-35 API's to the internal package. > >>>>>>>>>>>>>>> We should move the product forward and shouldn't hide major > >>>>>>>>>>>>> contribution from the user just because your second guess «I > >>>>>>>>>>>>> don’t > >>>>>>>> like > >>>>>>>>>>>> the > >>>>>>>>>>>>> API I just reviewed and approved». > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> We should move the product forward with with really finished > >>>>>>>>>>> features, > >>>>>>>>>>>>>> not pieces of features. > >>>>>>>>>>>>>> > >>>>>>>>>>>>>>> So I am against this proposal. > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> It is not argument. > >>>>>>>>>>>>>> > >>>>>>>>>>>>>>> But, I’m ready to see your proposal for the API change and > >>>>>> discuss > >>>>>>>>>>>> them. > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> We can prepare it together. But we can't block release. > >>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> Because IGNITE-11927 doesn't solve all problems > >>>>>>>>>>>>>>> What is *ALL* problems? > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> Redundant ReadOnlyMetricRegistry. > >>>>>>>>>>>>>> MetricExporterSpi that requires ReadOnlyMetricRegistry. > >>>>>>>>>>>>>> Absence of newly created metrics in old MBeans that forces user > >>>>>> use > >>>>>>>>>>>>>> exporter SPI while his code base uses old MBeans. > >>>>>>>>>>>>>> Inconsistent MetricRegistry API. > >>>>>>>>>>>>>> Metrics lookups from map instead of using direct reference > >>>>>>>>>>>>>> (performance problem). > >>>>>>>>>>>>>> Ignoring of statisticsEnabled flag. > >>>>>>>>>>>>>> JmxExporterSpi creates beans that doesn't satisfy best MBeans > >>>>>>>>>>>> practices. > >>>>>>>>>>>>>> Not finished IGNITE-11927 > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> It's enough I believe. > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> On Fri, Jan 17, 2020 at 7:28 PM Николай Ижиков < > >>>>>> nizhi...@apache.org > >>>>>>>>> > >>>>>>>>>>>>> wrote: > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> Andrey. > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> All issues Alexey mentioned in starting letter are fixed with > >>>>>>>>>>>>>>> my > >>>>>> PR > >>>>>>>>>>>> [1]. > >>>>>>>>>>>>>>> I don’t think other issues you mentioned are blocker for the > >>>>>>>>>>> release. > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> I talk about ignored existing functionality. > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> There is no existing tests that was broken by this > >>>>>>>>>>>>>>> contribution. > >>>>>>>>>>>>>>> If you know the issues with it, feel free to create a ticket I > >>>>>> will > >>>>>>>>>>>> fix > >>>>>>>>>>>>> it ASAP. > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> 1. Moving IEP-35 API's to the internal package. > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> We should move the product forward and shouldn't hide major > >>>>>>>>>>>>> contribution from the user just because your second guess «I > >>>>>>>>>>>>> don’t > >>>>>>>> like > >>>>>>>>>>>> the > >>>>>>>>>>>>> API I just reviewed and approved». > >>>>>>>>>>>>>>> So I am against this proposal. > >>>>>>>>>>>>>>> But, I’m ready to see your proposal for the API change and > >>>>>> discuss > >>>>>>>>>>>> them. > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> Because IGNITE-11927 doesn't solve all problems > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> What is *ALL* problems? > >>>>>>>>>>>>>>> Seems, we never be able to solve *ALL* problems. > >>>>>>>>>>>>>>> But, we should move the product forward. > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> As for your steps [1-6]. > >>>>>>>>>>>>>>> I’m always following these steps during my contribution. > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> [1] https://github.com/apache/ignite/pull/7269 > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> 17 янв. 2020 г., в 19:08, Andrey Gura <ag...@apache.org> > >>>>>>>>>>> написал(а): > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> The discussion is hot and can be endless. So in separate > >>>>>>>>>>>>>>>> post I > >>>>>>>>>>> want > >>>>>>>>>>>>>>>> propose my solution. > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> 1. Moving IEP-35 API's to the internal package. > >>>>>>>>>>>>>>>> 2. Create special feature branch B. > >>>>>>>>>>>>>>>> 3. In branch B will be merged IGNITE-11927 > >>>>>>>>>>>>>>>> 4. Because IGNITE-11927 doesn't solve all problems we should > >>>>>>>>>>> propose > >>>>>>>>>>>>>>>> solution and implement it in branch B. > >>>>>>>>>>>>>>>> 5. Testing, usability testing, fixing, etc iteratively. > >>>>>>>>>>>>>>>> 6. Merge it to master and in new release branch if needed. > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> Independent step. There are some problem which should be > >>>>>>>>>>>>>>>> fixed > >>>>>> in > >>>>>>>>>>> 2.8 > >>>>>>>>>>>>>>>> before release otherwise we introduce problems with > >>>>>> compatibility > >>>>>>>>>>>>>>>> which will haunt us till next major release. I'll create > >>>>>> tickets. > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> On Fri, Jan 17, 2020 at 7:03 PM Andrey Gura > >>>>>>>>>>>>>>>> <ag...@apache.org> > >>>>>>>>>>>> wrote: > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> Because it is brand new API and it requires rewrite client > >>>>>>>> code. > >>>>>>>>>>>>>>>>>> We doesn’t break backward compatibility. > >>>>>>>>>>>>>>>>>> The message is - this interface would be remove in the next > >>>>>>>> major > >>>>>>>>>>>>> release. > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> We don't know anything about development processes our > >>>>>>>>>>>>>>>>> users. I > >>>>>>>>>>> can > >>>>>>>>>>>>>>>>> admit that process could require that deprecated > >>>>>>>>>>>>>>>>> methods/APIs > >>>>>> are > >>>>>>>>>>>> not > >>>>>>>>>>>>>>>>> allowed for example. > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> ReadOnlyMetricRegistry > >>>>>>>>>>>>>>>>>>> Form user stand point it is very strange interface which > >>>>>> don't > >>>>>>>>>>>> give > >>>>>>>>>>>>> me any information about it’s purpose and responsibilities. > >>>>>>>>>>>>>>>>>>> Seems, I should explain proposed changes [1] more clear: > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> I understand this. But I'm not Ignite user, I'm Ignite > >>>>>> developer. > >>>>>>>>>>>> The > >>>>>>>>>>>>>>>>> key moment in my message *from user stand point*. From my > >>>>>>>>>>>>>>>>> point > >>>>>>>> of > >>>>>>>>>>>>>>>>> view it is very not intuitive solution and this interface is > >>>>>>>>>>>>>>>>> redundant. > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> Actually not. We have statisticsEnabled for caches for > >>>>>> example. > >>>>>>>>>>>>> There are other entities with such flag. > >>>>>>>>>>>>>>>>>> They still works as expected. > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> Actually not. I fixed many such issues during IGNITE-11927 > >>>>>>>>>>>>> implementation. > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> Why do you decided do in such way? > >>>>>>>>>>>>>>>>>> Because of the scope. > >>>>>>>>>>>>>>>>>> The ability to disable/enable metrics is the matter of the > >>>>>> other > >>>>>>>>>>>>> ticket. > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> I talk not about ability. I talk about ignored existing > >>>>>>>>>>>> functionality. > >>>>>>>>>>>>>>>>> So scope is not case here. > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> But they should not be exported by MetricExporterSpi > >>>>>>>>>>>>> implementations. > >>>>>>>>>>>>>>>>>> Actually, it’s a responsibility of the exporter to decide. > >>>>>>>>>>>>>>>>>> JMX exporter can exports ObjectMetric while OpenCensus > >>>>>> exporter > >>>>>>>>>>>>> can’t. > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> Actually list is not metric at all as I already told. > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> On Fri, Jan 17, 2020 at 5:26 PM Николай Ижиков < > >>>>>>>>>>> nizhi...@apache.org > >>>>>>>>>>>>> > >>>>>>>>>>>>> wrote: > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>> Andrey. > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> Because it is brand new API and it requires rewrite client > >>>>>>>> code. > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>> We doesn’t break backward compatibility. > >>>>>>>>>>>>>>>>>> The message is - this interface would be remove in the next > >>>>>>>> major > >>>>>>>>>>>>> release. > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> ReadOnlyMetricRegistry > >>>>>>>>>>>>>>>>>>> Form user stand point it is very strange interface which > >>>>>> don't > >>>>>>>>>>>> give > >>>>>>>>>>>>> me any information about it’s purpose and responsibilities. > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>> Seems, I should explain proposed changes [1] more clear: > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>> Each SPI would have a `ReadOnlyMetricManager` which > >>>>>>>>>>>>>>>>>> provides > >>>>>>>>>>> access > >>>>>>>>>>>>> to collection of `ReadOnlyMetricRegistry` > >>>>>>>>>>>>>>>>>> which has a collection of `Metric`. > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>> So we reflects two-level structure we have in the internal > >>>>>>>>>>>>>>>>>> API > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>> GridMetricManager -> Collection[MetricRegistry] -> > >>>>>>>>>>>> Collection[Metric] > >>>>>>>>>>>>>>>>>> ReadOnlyMetricManager -> > >>>>>>>>>>>>>>>>>> Collection[ReadOnlyMetricRegistry] -> > >>>>>>>>>>>>> Collection[Metric] > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> Actually not. We have statisticsEnabled for caches for > >>>>>> example. > >>>>>>>>>>>>> There are other entities with such flag. > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>> They still works as expected. > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> Why do you decided do in such way? > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>> Because of the scope. > >>>>>>>>>>>>>>>>>> The ability to disable/enable metrics is the matter of the > >>>>>> other > >>>>>>>>>>>>> ticket. > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> But they should not be exported by MetricExporterSpi > >>>>>>>>>>>>> implementations. > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>> Actually, it’s a responsibility of the exporter to decide. > >>>>>>>>>>>>>>>>>> JMX exporter can exports ObjectMetric while OpenCensus > >>>>>> exporter > >>>>>>>>>>>>> can’t. > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>> [1] > >>>>>>>>>>>>> > >>>>>>>>>>>> > >>>>>>>>>>> > >>>>>>>> > >>>>>> https://github.com/apache/ignite/pull/7269/files#diff-0ae5657231fc4c1f650493b02190b81bR25 > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> 17 янв. 2020 г., в 16:57, Andrey Gura <ag...@apache.org> > >>>>>>>>>>>>> написал(а): > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> If I’m not missing something, you were one of the active > >>>>>>>>>>>> reviewers > >>>>>>>>>>>>> of the Metric API. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> Yes. But if I'm not missing some thing you were major > >>>>>> developer > >>>>>>>>>>> of > >>>>>>>>>>>>>>>>>>> Metric API :) Shit happens. And it happened. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> The first, I agree with Alexey about deprecation of APIs > >>>>>> that > >>>>>>>>>>>> are > >>>>>>>>>>>>> still supported and don't offer reasonable substitution. > >>>>>>>>>>>>>>>>>>>> It has - MetricExporterSPI. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> There is such concept - backward compatibility. I > >>>>>>>>>>>>>>>>>>> understand > >>>>>>>>>>> that > >>>>>>>>>>>>>>>>>>> deprecation of some interface doesn't break backward > >>>>>>>>>>> compatibility > >>>>>>>>>>>>> but > >>>>>>>>>>>>>>>>>>> it leads to question^ what should I use instead of this. > >>>>>>>>>>>>>>>>>>> And > >>>>>>>>>>>>>>>>>>> MetricExporterSpi is not answer for this question. > >>>>>>>>>>>>>>>>>>> Because it > >>>>>>>> is > >>>>>>>>>>>>> brand > >>>>>>>>>>>>>>>>>>> new API and it requires rewrite client code. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> ReadOnlyMetricRegistry interface is redundant. > >>>>>>>>>>>>>>>>>>>> It’s an interface that exposes internal MetricRegistry > >>>>>>>>>>>>>>>>>>>> to > >>>>>> the > >>>>>>>>>>>>> exporters. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> No it is not. It's completely artificial thing which allow > >>>>>>>>>>> iterate > >>>>>>>>>>>>> via > >>>>>>>>>>>>>>>>>>> all metric registries. GridMetricManager implements this > >>>>>>>>>>> interface > >>>>>>>>>>>>>>>>>>> while it is not metric registry. Form user stand point it > >>>>>>>>>>>>>>>>>>> is > >>>>>>>>>>> very > >>>>>>>>>>>>>>>>>>> strange interface which don't give me any information > >>>>>>>>>>>>>>>>>>> about > >>>>>>>> it's > >>>>>>>>>>>>>>>>>>> purpose and responsibilities. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> Exporters expose metrics if they are disabled. > >>>>>>>>>>>>>>>>>>>> We don’t have an ability to disable metrics. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> Actually not. We have statisticsEnabled for caches for > >>>>>> example. > >>>>>>>>>>>>> There > >>>>>>>>>>>>>>>>>>> are other entities with such flag. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> And that done, intentionally. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> Why do you decided do in such way? Why you ignore existing > >>>>>>>>>>>>>>>>>>> functionality? It affects user expectations and > >>>>>>>>>>>>>>>>>>> experience. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> You are working on this issue, aren’t you? > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> Yes? I'm working. Unfortunately we are not synchronized in > >>>>>> this > >>>>>>>>>>>>>>>>>>> context and I should redo all metrics related changes in > >>>>>> order > >>>>>>>>>>> to > >>>>>>>>>>>>>>>>>>> merge it with my changes. Anyway, my change doesn't solve > >>>>>>>>>>>>>>>>>>> all > >>>>>>>>>>>>> problems > >>>>>>>>>>>>>>>>>>> (e.g. it doesn't introduce IgniteMonitoring facade). > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> I can fix this issue, by myself. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> Unfortunately it will be just fix. In my solution it is > >>>>>>>>>>> redesign. > >>>>>>>>>>>>> Stop > >>>>>>>>>>>>>>>>>>> fixing issues, let's do things. It requires deeper > >>>>>>>>>>>>>>>>>>> changes. > >>>>>> My > >>>>>>>>>>>>> changes > >>>>>>>>>>>>>>>>>>> blocks AI 2.8 release because it big enough. So it > >>>>>>>>>>>>>>>>>>> retargeted > >>>>>>>> on > >>>>>>>>>>>> the > >>>>>>>>>>>>>>>>>>> next release. And it is one more reason for moving the > >>>>>> changes > >>>>>>>>>>> to > >>>>>>>>>>>>> the > >>>>>>>>>>>>>>>>>>> internal packages. And it isn't good news for me because I > >>>>>> will > >>>>>>>>>>> go > >>>>>>>>>>>>>>>>>>> throughout pan and tiers of merge. But it is right. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> Metrics of type lists are not metric at all. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> They are created to deal with backward compatibility. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> Metrics of type lists are not metric at all. > >>>>>>>>>>>>>>>>>>>> They are created to deal with backward compatibility. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> Yes, I know. But they should not be exported by > >>>>>>>>>>> MetricExporterSpi > >>>>>>>>>>>>>>>>>>> implementations. > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> On Fri, Jan 17, 2020 at 3:37 PM Николай Ижиков < > >>>>>>>>>>>> nizhi...@apache.org> > >>>>>>>>>>>>> wrote: > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> Andrey, thanks for your opinion and your ownest > >>>>>>>>>>>>>>>>>>>> critisism. > >>>>>>>>>>>>>>>>>>>> I can’t wait for your contribution. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> If I’m not missing something, you were one of the active > >>>>>>>>>>>> reviewers > >>>>>>>>>>>>> of the Metric API. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> The first, I agree with Alexey about deprecation of APIs > >>>>>> that > >>>>>>>>>>>> are > >>>>>>>>>>>>> still supported and don't offer reasonable substitution. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> It has - MetricExporterSPI. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> The second, from my point of view, we can't recommend > >>>>>>>>>>>>> MetricExporterSpi's because it are still not-production ready. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> It’s ready. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> The third, moving of MetricRegistry to the public API > >>>>>> doesn't > >>>>>>>>>>>>> solve the problem because this interface exposes internal Metric > >>>>>>>>>>>> interface > >>>>>>>>>>>>> implementations. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> Not, its’ not. > >>>>>>>>>>>>>>>>>>>> Please, see `org.apache.ignite.spi.metric.LongMetric` and > >>>>>>>> other > >>>>>>>>>>>>> public interface. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> API of MetricRegistry is inconsistent. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> MetricRegistry is the internal API. > >>>>>>>>>>>>>>>>>>>> Feel free to create ticket for an issues with it and I > >>>>>>>>>>>>>>>>>>>> will > >>>>>>>> try > >>>>>>>>>>>> to > >>>>>>>>>>>>> fix it. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> ReadOnlyMetricRegistry interface is redundant. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> It’s an interface that exposes internal MetricRegistry > >>>>>>>>>>>>>>>>>>>> to > >>>>>> the > >>>>>>>>>>>>> exporters. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> Exporters expose metrics if they are disabled. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> We don’t have an ability to disable metrics. > >>>>>>>>>>>>>>>>>>>> And that done, intentionally. > >>>>>>>>>>>>>>>>>>>> You are working on this issue, aren’t you? > >>>>>>>>>>>>>>>>>>>> I can fix this issue, by myself. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> Metrics of type lists are not metric at all. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> They are created to deal with backward compatibility. > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> 17 янв. 2020 г., в 15:09, Andrey Gura <ag...@apache.org> > >>>>>>>>>>>>> написал(а): > >>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> Hi, > >>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> The first, I agree with Alexey about deprecation of APIs > >>>>>> that > >>>>>>>>>>>> are > >>>>>>>>>>>>>>>>>>>>> still supported and don't offer reasonable substitution. > >>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> The second, from my point of view, we can't recommend > >>>>>>>>>>>>>>>>>>>>> MetricExporterSpi's because it are still not-production > >>>>>>>> ready. > >>>>>>>>>>>>> There > >>>>>>>>>>>>>>>>>>>>> are some issues with it and usage of > >>>>>>>>>>>>>>>>>>>>> ReadOnlyMetricRegistry > >>>>>>>>>>>>> interface > >>>>>>>>>>>>>>>>>>>>> just one of them. > >>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> The third, moving of MetricRegistry to the public API > >>>>>> doesn't > >>>>>>>>>>>>> solve > >>>>>>>>>>>>>>>>>>>>> the problem because this interface exposes internal > >>>>>>>>>>>>>>>>>>>>> Metric > >>>>>>>>>>>>> interface > >>>>>>>>>>>>>>>>>>>>> implementations. So your PR is incomplete. > >>>>>>>>>>>>>>>>>>>>> Moreover, API of MetricRegistry is inconsistent. E.g. > >>>>>>>>>>>>> register(name, > >>>>>>>>>>>>>>>>>>>>> supplier, desc) method returns registered metric for > >>>>>>>>>>>>>>>>>>>>> some > >>>>>>>>>>> types > >>>>>>>>>>>>> and > >>>>>>>>>>>>>>>>>>>>> doesn't for other. register(metric) method is > >>>>>>>>>>>>>>>>>>>>> inconsistent > >>>>>> in > >>>>>>>>>>>>> sense of > >>>>>>>>>>>>>>>>>>>>> metric naming. ReadOnlyMetricRegistry interface is > >>>>>> redundant. > >>>>>>>>>>>>>>>>>>>>> MetricExporterSpi should be revised because it > >>>>>>>>>>>>>>>>>>>>> absolutely > >>>>>> not > >>>>>>>>>>>>>>>>>>>>> intuitive because it requires ReadOnlyMetricRegistry and > >>>>>> it's > >>>>>>>>>>>>> purpose > >>>>>>>>>>>>>>>>>>>>> is undefined. > >>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> One more point. IEP-35 is still not fully implemented. > >>>>>>>>>>>>>>>>>>>>> Some > >>>>>>>>>>>>> things are > >>>>>>>>>>>>>>>>>>>>> not taken into account. Exporters expose metrics if they > >>>>>> are > >>>>>>>>>>>>> disabled. > >>>>>>>>>>>>>>>>>>>>> JMX beans exposes values that don't confirm to best > >>>>>> practices > >>>>>>>>>>>> [1]. > >>>>>>>>>>>>>>>>>>>>> Metrics of type lists are not metric at all. Ubiquitous > >>>>>>>> merics > >>>>>>>>>>>>> lookup > >>>>>>>>>>>>>>>>>>>>> from hash map instead of usage reference for getting > >>>>>> metrics > >>>>>>>>>>>>> values > >>>>>>>>>>>>>>>>>>>>> (it is just performance issue). Also IGNITE-11927 is not > >>>>>>>>>>>>> implemented > >>>>>>>>>>>>>>>>>>>>> which also changes interfaces significantly. > >>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> Let's just admit that the implementation is immature and > >>>>>> must > >>>>>>>>>>> be > >>>>>>>>>>>>> moved > >>>>>>>>>>>>>>>>>>>>> to the internal packages. > >>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> And because we already merged partially implemented IEP > >>>>>>>>>>>>>>>>>>>>> to > >>>>>>>> the > >>>>>>>>>>>>> master > >>>>>>>>>>>>>>>>>>>>> branch we *must move all currently public APIs to the > >>>>>>>> internal > >>>>>>>>>>>>> API* > >>>>>>>>>>>>>>>>>>>>> while it will not be ready for publication. > >>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> And the last but not least. What is happening indicates > >>>>>>>>>>>>>>>>>>>>> a > >>>>>>>>>>>> immature > >>>>>>>>>>>>>>>>>>>>> development process which must be revised. I don't want > >>>>>>>>>>> discuss > >>>>>>>>>>>>> it in > >>>>>>>>>>>>>>>>>>>>> this thread but we must not allow merge of change to the > >>>>>>>>>>> master > >>>>>>>>>>>>> branch > >>>>>>>>>>>>>>>>>>>>> before it will completed, that is we must use feature > >>>>>>>> branches > >>>>>>>>>>>> for > >>>>>>>>>>>>>>>>>>>>> full IEP not only for particular tickets. And also we > >>>>>> should > >>>>>>>>>>>>>>>>>>>>> reformulate IEP process in order to avoid things like > >>>>>>>>>>>>>>>>>>>>> this. > >>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> [1] > >>>>>>>>>>>>> > >>>>>>>>>>>> > >>>>>>>>>>> > >>>>>>>> > >>>>>> https://www.oracle.com/technetwork/java/javase/tech/best-practices-jsp-136021.html > >>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>> On Fri, Jan 17, 2020 at 12:49 PM Николай Ижиков < > >>>>>>>>>>>>> nizhi...@apache.org> wrote: > >>>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>>> Alex. > >>>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>>> OK, I may leverage your experience and create pure Java > >>>>>> API. > >>>>>>>>>>>>>>>>>>>>>> Ticket [1] created. > >>>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>>> But, personally, I don’t agree with you. > >>>>>>>>>>>>>>>>>>>>>> Ignite has dozens of the API that theoretically have a > >>>>>> usage > >>>>>>>>>>>>> scenario, but in real-world have 0 custom implementation and > >>>>>> usages. > >>>>>>>>>>>>>>>>>>>>>> Moreover, many APIs that were created with the > >>>>>>>>>>>>>>>>>>>>>> intentions > >>>>>>>> you > >>>>>>>>>>>>> mentioned is abandoned now and confuses users. > >>>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>>> You can just see count of the tests we just mute on the > >>>>>> TC. > >>>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>>> Can you, please, take a look at the fix regarding puck > >>>>>>>>>>>>>>>>>>>>>> API > >>>>>>>>>>>> issue > >>>>>>>>>>>>> you mentioned in your first letter [2], [3] > >>>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>>> [1] https://issues.apache.org/jira/browse/IGNITE-12553 > >>>>>>>>>>>>>>>>>>>>>> [2] https://github.com/apache/ignite/pull/7269 > >>>>>>>>>>>>>>>>>>>>>> [3] https://issues.apache.org/jira/browse/IGNITE-12552 > >>>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>>>> 17 янв. 2020 г., в 12:12, Alexey Goncharuk < > >>>>>>>>>>>>> alexey.goncha...@gmail.com> написал(а): > >>>>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>>>> Nikolay, > >>>>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>>>>> Why do you think this is a wrong usage pattern? From > >>>>>>>>>>>>>>>>>>>>>>> the > >>>>>>>> top > >>>>>>>>>>>> of > >>>>>>>>>>>>> my head, > >>>>>>>>>>>>>>>>>>>>>>> here is a few cases of direct metric API usage that I > >>>>>> know > >>>>>>>>>>> are > >>>>>>>>>>>>> currently > >>>>>>>>>>>>>>>>>>>>>>> being used in production: > >>>>>>>>>>>>>>>>>>>>>>> * A custom task execution scheduling service with load > >>>>>>>>>>>>> balancing based on > >>>>>>>>>>>>>>>>>>>>>>> utilization metrics readings from Java code > >>>>>>>>>>>>>>>>>>>>>>> * Cleanup task trigger based on metrics readings > >>>>>>>>>>>>>>>>>>>>>>> * A custom health-check endpoint for an application > >>>>>>>>>>>>>>>>>>>>>>> with > >>>>>> an > >>>>>>>>>>>>> embedded > >>>>>>>>>>>>>>>>>>>>>>> Ignite node for Kubernetes/Spring Application/etc > >>>>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> > >>>>>>>>>>>>> > >>>>>>>>>>>>> > >>>>>>>>>>>> > >>>>>>>>>>> > >>>>>>>> > >>>>>>>> > >>>>>> > >>>>>> > >>>> > >>> > >> > >
