Add endpoint to fetch stats for Prometheus #294

merlimat · 2017-03-14T21:50:47Z

Motivation

Expose Pulsar broker metrics in a format suitable for Prometheus monitoring platform.

Modifications

Added a new REST endpoint (/admin/broker-stats/metrics-prometheus) that can be called to fetch the stats.

Metrics are returned in text format as defined at https://prometheus.io/docs/instrumenting/exposition_formats/

Result

Prometheus can easily be used to monitor a Pulsar cluster and create time-series dashboards for namespaces.

merlimat · 2017-03-14T21:54:56Z

/cc @agarman. I also have some dashboards on the works

agarman · 2017-03-15T00:38:33Z

That's great. Sorry my team's participation is currently in limbo.

rdhabalia

LGTM just minor comments.

rdhabalia · 2017-03-31T21:38:40Z

managed-ledger/src/main/java/org/apache/bookkeeper/mledger/util/StatsBuckets.java

should we also check isSorted(other.boundaries)?

since the other is also a StatsBuckets the sorted check would have been already performed in its own constructor

rdhabalia · 2017-03-31T22:17:26Z

...roker/src/main/java/com/yahoo/pulsar/broker/stats/prometheus/PrometheusMetricsGenerator.java

As NamespaceStatsAggregator already has thread-local localNamespaceStats, so what if we make PrometheusMetricsGenerator singleton and move NamespaceStatsAggregator to class variable so, we don't have to create new object of PrometheusMetricsGenerator and NamespaceStatsAggregator everytime. will it be a problem?

Fixed, made everything static.

rdhabalia · 2017-03-31T22:23:55Z

pulsar-broker/src/main/java/com/yahoo/pulsar/broker/admin/BrokerStats.java

if pulsar().getExecutor() has 20 threads in pool so, if all of them keeps AggregatedNamespaceStats as thread-local then does it make sense to use executor with lower number of thread to reduce number of stats objects in thread-local?

Good point. We could have a 1 thread executor for such background tasks. I was looking the the /broker-stats/metrics endpoint and we're doing generation from the web thread, which could be 1 out 32 :)

rdhabalia · 2017-04-08T01:35:23Z

managed-ledger/src/main/java/org/apache/bookkeeper/mledger/util/StatsBuckets.java

I think it should be i < buckets.length

Good catch, fixed.

merlimat · 2017-05-27T02:08:18Z

@rdhabalia Updated, PTAL

rdhabalia

LGTM.. just minor comments. 👍

rdhabalia · 2017-05-31T00:42:43Z

...roker/src/main/java/com/yahoo/pulsar/broker/stats/prometheus/PrometheusMetricsGenerator.java

+            @SuppressWarnings("restriction")
+            @Override
+            public double get() {
+                return sun.misc.VM.maxDirectMemory();


should we use JvmMetrics. getJvmDirectMemoryUsed() as we know that sun.misc.VM.maxDirectMemory() may give wrong result?

This is to get the max direct memory configured. For the used mem, I'm using JvmMetrics. getJvmDirectMemoryUsed() a couple of lines above :)

Oops.. my bad.

rdhabalia · 2017-05-31T00:50:02Z

pulsar-broker/src/main/java/com/yahoo/pulsar/broker/admin/BrokerStats.java

 import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
 import javax.ws.rs.WebApplicationException;
+import javax.ws.rs.container.AsyncResponse;


It seems there are multiple unused imports in this class.

### Motivation When a Pulsar topic is unloaded from a broker, certain metrics related to that topic will appear to remain active for the broker for 5 minutes. This is confusing for troubleshooting because it makes the topic appear to be owned by multiple brokers for a short period of time. See below for a way to reproduce this behavior. In order to solve this "zombie" metric problem, I propose we remove the timestamps that get exported with each Prometheus metric served by the broker. ### Analysis Since we introduced Prometheus metrics in #294, we have exported a timestamp along with most metrics. This is an optional, valid part of the spec defined [here](https://prometheus.io/docs/instrumenting/exposition_formats/#comments-help-text-and-type-information). However, after our adoption of Prometheus metrics, the Prometheus project released version 2.0 with a significant improvement to its concept of staleness. In short, before 2.0, a metric that was in the last scrape but not the next one (this often happens for topics that are unloaded) will essentially inherit the most recent value for the last 5 minute window. If there isn't one in the past 5 minutes, the metric becomes "stale" and isn't reported. Starting in 2.0, there was new logic to consider a value stale the very first time that it is not reported in a scrape. Importantly, this new behavior is only available if you do not export timestamps with metrics, as documented here: https://prometheus.io/docs/prometheus/latest/querying/basics/#staleness. We want to use the new behavior because it gives better insight into all topic metrics, which are subject to move between brokers at any time. This presentation https://www.youtube.com/watch?v=GcTzd2CLH7I and slide deck https://promcon.io/2017-munich/slides/staleness-in-prometheus-2-0.pdf document the feature in detail. This blog post was also helpful: https://www.robustperception.io/staleness-and-promql/. Additional motivation comes from mailing list threads like this one https://groups.google.com/g/prometheus-users/c/8OFAwp1OEcY. It says: > Note, however, that adding timestamps is an extremely niche use case. Most of the users who think the need it should actually not do it. > > The main usecases within that tiny niche are federation and mirroring the data from another monitoring system. The Prometheus Go client also indicates a similar motivation: https://pkg.go.dev/github.com/prometheus/client_golang/prometheus#NewMetricWithTimestamp. The OpenMetrics project also recommends against exporting timestamps: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#exposing-timestamps. As such, I think we are not a niche use case, and we should not add timestamps to our metrics. ### Reproducing the problem 1. Run any 2.x version of Prometheus (I used 2.31.0) along with the following scrape config: ```yaml - job_name: broker honor_timestamps: true scrape_interval: 30s scrape_timeout: 10s metrics_path: /metrics scheme: http follow_redirects: true static_configs: - targets: ["localhost:8080"] ``` 2. Start pulsar standalone on the same machine. I used a recently compiled version of master. 3. Publish messages to a topic. 4. Observe `pulsar_in_messages_total` metric for the topic in the prometheus UI (localhost:9090) 5. Stop the producer. 6. Unload the topic from the broker. 7. Optionally, `curl` the metrics endpoint to verify that the topic’s `pulsar_in_messages_total` metric is no longer reported. 8. Watch the metrics get reported in prometheus for 5 additional minutes. When you set `honor_timestamps: false`, the metric stops getting reported right after the topic is unloaded, which is the desired behavior. ### Modifications * Remove all timestamps from metrics * Fix affected tests and test files (some of those tests were in the proxy and the function worker, but no code was changed for those modules) ### Verifying this change This change is accompanied by updated tests. ### Does this pull request potentially affect one of the following parts: This is technically a breaking change to the metrics, though I would consider it a bug fix at this point. I will discuss it on the mailing list to ensure it gets proper visibility. Given how frequently Pulsar changes which metrics are exposed between each scrape, I think this is an important fix that should be cherry picked to older release branches. Technically, we can avoid cherry picking this change if we advise users to set `honor_timestamps: false`. However, I think it is better to just remove them. ### Documentation - [x] `doc-not-needed`

When a Pulsar topic is unloaded from a broker, certain metrics related to that topic will appear to remain active for the broker for 5 minutes. This is confusing for troubleshooting because it makes the topic appear to be owned by multiple brokers for a short period of time. See below for a way to reproduce this behavior. In order to solve this "zombie" metric problem, I propose we remove the timestamps that get exported with each Prometheus metric served by the broker. Since we introduced Prometheus metrics in #294, we have exported a timestamp along with most metrics. This is an optional, valid part of the spec defined [here](https://prometheus.io/docs/instrumenting/exposition_formats/#comments-help-text-and-type-information). However, after our adoption of Prometheus metrics, the Prometheus project released version 2.0 with a significant improvement to its concept of staleness. In short, before 2.0, a metric that was in the last scrape but not the next one (this often happens for topics that are unloaded) will essentially inherit the most recent value for the last 5 minute window. If there isn't one in the past 5 minutes, the metric becomes "stale" and isn't reported. Starting in 2.0, there was new logic to consider a value stale the very first time that it is not reported in a scrape. Importantly, this new behavior is only available if you do not export timestamps with metrics, as documented here: https://prometheus.io/docs/prometheus/latest/querying/basics/#staleness. We want to use the new behavior because it gives better insight into all topic metrics, which are subject to move between brokers at any time. This presentation https://www.youtube.com/watch?v=GcTzd2CLH7I and slide deck https://promcon.io/2017-munich/slides/staleness-in-prometheus-2-0.pdf document the feature in detail. This blog post was also helpful: https://www.robustperception.io/staleness-and-promql/. Additional motivation comes from mailing list threads like this one https://groups.google.com/g/prometheus-users/c/8OFAwp1OEcY. It says: > Note, however, that adding timestamps is an extremely niche use case. Most of the users who think the need it should actually not do it. > > The main usecases within that tiny niche are federation and mirroring the data from another monitoring system. The Prometheus Go client also indicates a similar motivation: https://pkg.go.dev/github.com/prometheus/client_golang/prometheus#NewMetricWithTimestamp. The OpenMetrics project also recommends against exporting timestamps: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#exposing-timestamps. As such, I think we are not a niche use case, and we should not add timestamps to our metrics. 1. Run any 2.x version of Prometheus (I used 2.31.0) along with the following scrape config: ```yaml - job_name: broker honor_timestamps: true scrape_interval: 30s scrape_timeout: 10s metrics_path: /metrics scheme: http follow_redirects: true static_configs: - targets: ["localhost:8080"] ``` 2. Start pulsar standalone on the same machine. I used a recently compiled version of master. 3. Publish messages to a topic. 4. Observe `pulsar_in_messages_total` metric for the topic in the prometheus UI (localhost:9090) 5. Stop the producer. 6. Unload the topic from the broker. 7. Optionally, `curl` the metrics endpoint to verify that the topic’s `pulsar_in_messages_total` metric is no longer reported. 8. Watch the metrics get reported in prometheus for 5 additional minutes. When you set `honor_timestamps: false`, the metric stops getting reported right after the topic is unloaded, which is the desired behavior. * Remove all timestamps from metrics * Fix affected tests and test files (some of those tests were in the proxy and the function worker, but no code was changed for those modules) This change is accompanied by updated tests. This is technically a breaking change to the metrics, though I would consider it a bug fix at this point. I will discuss it on the mailing list to ensure it gets proper visibility. Given how frequently Pulsar changes which metrics are exposed between each scrape, I think this is an important fix that should be cherry picked to older release branches. Technically, we can avoid cherry picking this change if we advise users to set `honor_timestamps: false`. However, I think it is better to just remove them. - [x] `doc-not-needed` (cherry picked from commit 0bbc4e1)

### Motivation When a Pulsar topic is unloaded from a broker, certain metrics related to that topic will appear to remain active for the broker for 5 minutes. This is confusing for troubleshooting because it makes the topic appear to be owned by multiple brokers for a short period of time. See below for a way to reproduce this behavior. In order to solve this "zombie" metric problem, I propose we remove the timestamps that get exported with each Prometheus metric served by the broker. ### Analysis Since we introduced Prometheus metrics in #294, we have exported a timestamp along with most metrics. This is an optional, valid part of the spec defined [here](https://prometheus.io/docs/instrumenting/exposition_formats/#comments-help-text-and-type-information). However, after our adoption of Prometheus metrics, the Prometheus project released version 2.0 with a significant improvement to its concept of staleness. In short, before 2.0, a metric that was in the last scrape but not the next one (this often happens for topics that are unloaded) will essentially inherit the most recent value for the last 5 minute window. If there isn't one in the past 5 minutes, the metric becomes "stale" and isn't reported. Starting in 2.0, there was new logic to consider a value stale the very first time that it is not reported in a scrape. Importantly, this new behavior is only available if you do not export timestamps with metrics, as documented here: https://prometheus.io/docs/prometheus/latest/querying/basics/#staleness. We want to use the new behavior because it gives better insight into all topic metrics, which are subject to move between brokers at any time. This presentation https://www.youtube.com/watch?v=GcTzd2CLH7I and slide deck https://promcon.io/2017-munich/slides/staleness-in-prometheus-2-0.pdf document the feature in detail. This blog post was also helpful: https://www.robustperception.io/staleness-and-promql/. Additional motivation comes from mailing list threads like this one https://groups.google.com/g/prometheus-users/c/8OFAwp1OEcY. It says: > Note, however, that adding timestamps is an extremely niche use case. Most of the users who think the need it should actually not do it. > > The main usecases within that tiny niche are federation and mirroring the data from another monitoring system. The Prometheus Go client also indicates a similar motivation: https://pkg.go.dev/github.com/prometheus/client_golang/prometheus#NewMetricWithTimestamp. The OpenMetrics project also recommends against exporting timestamps: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#exposing-timestamps. As such, I think we are not a niche use case, and we should not add timestamps to our metrics. ### Reproducing the problem 1. Run any 2.x version of Prometheus (I used 2.31.0) along with the following scrape config: ```yaml - job_name: broker honor_timestamps: true scrape_interval: 30s scrape_timeout: 10s metrics_path: /metrics scheme: http follow_redirects: true static_configs: - targets: ["localhost:8080"] ``` 2. Start pulsar standalone on the same machine. I used a recently compiled version of master. 3. Publish messages to a topic. 4. Observe `pulsar_in_messages_total` metric for the topic in the prometheus UI (localhost:9090) 5. Stop the producer. 6. Unload the topic from the broker. 7. Optionally, `curl` the metrics endpoint to verify that the topic’s `pulsar_in_messages_total` metric is no longer reported. 8. Watch the metrics get reported in prometheus for 5 additional minutes. When you set `honor_timestamps: false`, the metric stops getting reported right after the topic is unloaded, which is the desired behavior. ### Modifications * Remove all timestamps from metrics * Fix affected tests and test files (some of those tests were in the proxy and the function worker, but no code was changed for those modules) ### Verifying this change This change is accompanied by updated tests. ### Does this pull request potentially affect one of the following parts: This is technically a breaking change to the metrics, though I would consider it a bug fix at this point. I will discuss it on the mailing list to ensure it gets proper visibility. Given how frequently Pulsar changes which metrics are exposed between each scrape, I think this is an important fix that should be cherry picked to older release branches. Technically, we can avoid cherry picking this change if we advise users to set `honor_timestamps: false`. However, I think it is better to just remove them. ### Documentation - [x] `doc-not-needed` (cherry picked from commit 0bbc4e1)

When a Pulsar topic is unloaded from a broker, certain metrics related to that topic will appear to remain active for the broker for 5 minutes. This is confusing for troubleshooting because it makes the topic appear to be owned by multiple brokers for a short period of time. See below for a way to reproduce this behavior. In order to solve this "zombie" metric problem, I propose we remove the timestamps that get exported with each Prometheus metric served by the broker. Since we introduced Prometheus metrics in #294, we have exported a timestamp along with most metrics. This is an optional, valid part of the spec defined [here](https://prometheus.io/docs/instrumenting/exposition_formats/#comments-help-text-and-type-information). However, after our adoption of Prometheus metrics, the Prometheus project released version 2.0 with a significant improvement to its concept of staleness. In short, before 2.0, a metric that was in the last scrape but not the next one (this often happens for topics that are unloaded) will essentially inherit the most recent value for the last 5 minute window. If there isn't one in the past 5 minutes, the metric becomes "stale" and isn't reported. Starting in 2.0, there was new logic to consider a value stale the very first time that it is not reported in a scrape. Importantly, this new behavior is only available if you do not export timestamps with metrics, as documented here: https://prometheus.io/docs/prometheus/latest/querying/basics/#staleness. We want to use the new behavior because it gives better insight into all topic metrics, which are subject to move between brokers at any time. This presentation https://www.youtube.com/watch?v=GcTzd2CLH7I and slide deck https://promcon.io/2017-munich/slides/staleness-in-prometheus-2-0.pdf document the feature in detail. This blog post was also helpful: https://www.robustperception.io/staleness-and-promql/. Additional motivation comes from mailing list threads like this one https://groups.google.com/g/prometheus-users/c/8OFAwp1OEcY. It says: > Note, however, that adding timestamps is an extremely niche use case. Most of the users who think the need it should actually not do it. > > The main usecases within that tiny niche are federation and mirroring the data from another monitoring system. The Prometheus Go client also indicates a similar motivation: https://pkg.go.dev/github.com/prometheus/client_golang/prometheus#NewMetricWithTimestamp. The OpenMetrics project also recommends against exporting timestamps: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#exposing-timestamps. As such, I think we are not a niche use case, and we should not add timestamps to our metrics. 1. Run any 2.x version of Prometheus (I used 2.31.0) along with the following scrape config: ```yaml - job_name: broker honor_timestamps: true scrape_interval: 30s scrape_timeout: 10s metrics_path: /metrics scheme: http follow_redirects: true static_configs: - targets: ["localhost:8080"] ``` 2. Start pulsar standalone on the same machine. I used a recently compiled version of master. 3. Publish messages to a topic. 4. Observe `pulsar_in_messages_total` metric for the topic in the prometheus UI (localhost:9090) 5. Stop the producer. 6. Unload the topic from the broker. 7. Optionally, `curl` the metrics endpoint to verify that the topic’s `pulsar_in_messages_total` metric is no longer reported. 8. Watch the metrics get reported in prometheus for 5 additional minutes. When you set `honor_timestamps: false`, the metric stops getting reported right after the topic is unloaded, which is the desired behavior. * Remove all timestamps from metrics * Fix affected tests and test files (some of those tests were in the proxy and the function worker, but no code was changed for those modules) This change is accompanied by updated tests. This is technically a breaking change to the metrics, though I would consider it a bug fix at this point. I will discuss it on the mailing list to ensure it gets proper visibility. Given how frequently Pulsar changes which metrics are exposed between each scrape, I think this is an important fix that should be cherry picked to older release branches. Technically, we can avoid cherry picking this change if we advise users to set `honor_timestamps: false`. However, I think it is better to just remove them. - [x] `doc-not-needed` (cherry picked from commit 0bbc4e1) (cherry picked from commit e59aac7)

### Motivation When a Pulsar topic is unloaded from a broker, certain metrics related to that topic will appear to remain active for the broker for 5 minutes. This is confusing for troubleshooting because it makes the topic appear to be owned by multiple brokers for a short period of time. See below for a way to reproduce this behavior. In order to solve this "zombie" metric problem, I propose we remove the timestamps that get exported with each Prometheus metric served by the broker. ### Analysis Since we introduced Prometheus metrics in apache#294, we have exported a timestamp along with most metrics. This is an optional, valid part of the spec defined [here](https://prometheus.io/docs/instrumenting/exposition_formats/#comments-help-text-and-type-information). However, after our adoption of Prometheus metrics, the Prometheus project released version 2.0 with a significant improvement to its concept of staleness. In short, before 2.0, a metric that was in the last scrape but not the next one (this often happens for topics that are unloaded) will essentially inherit the most recent value for the last 5 minute window. If there isn't one in the past 5 minutes, the metric becomes "stale" and isn't reported. Starting in 2.0, there was new logic to consider a value stale the very first time that it is not reported in a scrape. Importantly, this new behavior is only available if you do not export timestamps with metrics, as documented here: https://prometheus.io/docs/prometheus/latest/querying/basics/#staleness. We want to use the new behavior because it gives better insight into all topic metrics, which are subject to move between brokers at any time. This presentation https://www.youtube.com/watch?v=GcTzd2CLH7I and slide deck https://promcon.io/2017-munich/slides/staleness-in-prometheus-2-0.pdf document the feature in detail. This blog post was also helpful: https://www.robustperception.io/staleness-and-promql/. Additional motivation comes from mailing list threads like this one https://groups.google.com/g/prometheus-users/c/8OFAwp1OEcY. It says: > Note, however, that adding timestamps is an extremely niche use case. Most of the users who think the need it should actually not do it. > > The main usecases within that tiny niche are federation and mirroring the data from another monitoring system. The Prometheus Go client also indicates a similar motivation: https://pkg.go.dev/github.com/prometheus/client_golang/prometheus#NewMetricWithTimestamp. The OpenMetrics project also recommends against exporting timestamps: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#exposing-timestamps. As such, I think we are not a niche use case, and we should not add timestamps to our metrics. ### Reproducing the problem 1. Run any 2.x version of Prometheus (I used 2.31.0) along with the following scrape config: ```yaml - job_name: broker honor_timestamps: true scrape_interval: 30s scrape_timeout: 10s metrics_path: /metrics scheme: http follow_redirects: true static_configs: - targets: ["localhost:8080"] ``` 2. Start pulsar standalone on the same machine. I used a recently compiled version of master. 3. Publish messages to a topic. 4. Observe `pulsar_in_messages_total` metric for the topic in the prometheus UI (localhost:9090) 5. Stop the producer. 6. Unload the topic from the broker. 7. Optionally, `curl` the metrics endpoint to verify that the topic’s `pulsar_in_messages_total` metric is no longer reported. 8. Watch the metrics get reported in prometheus for 5 additional minutes. When you set `honor_timestamps: false`, the metric stops getting reported right after the topic is unloaded, which is the desired behavior. ### Modifications * Remove all timestamps from metrics * Fix affected tests and test files (some of those tests were in the proxy and the function worker, but no code was changed for those modules) ### Verifying this change This change is accompanied by updated tests. ### Does this pull request potentially affect one of the following parts: This is technically a breaking change to the metrics, though I would consider it a bug fix at this point. I will discuss it on the mailing list to ensure it gets proper visibility. Given how frequently Pulsar changes which metrics are exposed between each scrape, I think this is an important fix that should be cherry picked to older release branches. Technically, we can avoid cherry picking this change if we advise users to set `honor_timestamps: false`. However, I think it is better to just remove them. ### Documentation - [x] `doc-not-needed` (cherry picked from commit 0bbc4e1)

merlimat added the type/feature The PR added a new feature or issue requested a new feature label Mar 14, 2017

merlimat added this to the 1.17 milestone Mar 14, 2017

merlimat self-assigned this Mar 14, 2017

merlimat modified the milestones: 1.17, 1.18 Mar 31, 2017

rdhabalia reviewed Mar 31, 2017

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rdhabalia reviewed Apr 8, 2017

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merlimat force-pushed the prometheus branch from 176745e to 3148ccc Compare May 27, 2017 02:07

merlimat force-pushed the prometheus branch from 3148ccc to efb32e6 Compare May 28, 2017 06:34

Add endpoint to fetch stats for Prometheus

2513f3d

merlimat force-pushed the prometheus branch from efb32e6 to 2513f3d Compare May 29, 2017 16:27

merlimat requested a review from saandrews May 31, 2017 00:30

rdhabalia approved these changes May 31, 2017

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Removed unused imports

e8213ab

merlimat merged commit e93a4c3 into apache:master May 31, 2017

hrsakai pushed a commit to hrsakai/pulsar that referenced this pull request Dec 10, 2020

Use gogofast to have in-place protobuf serialization (apache#294)

549874b

hangc0276 pushed a commit to hangc0276/pulsar that referenced this pull request May 26, 2021

Add @BewareMyPower as code owner (apache#294)

5f2ee3c

xiaotongwang1 mentioned this pull request Aug 4, 2021

Pulsar 2.7.0+ KOP 2.7.2.x getPartitionedTopicMetadata timeout #11532

Closed

michaeljmarshall mentioned this pull request Sep 2, 2022

[fix][broker] Remove timestamp from Prometheus metrics #17419

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Add endpoint to fetch stats for Prometheus #294

Add endpoint to fetch stats for Prometheus #294

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merlimat commented Mar 14, 2017

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merlimat commented Mar 14, 2017

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merlimat commented May 27, 2017

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