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Implement ability for extensions to be notified about effective configuration #6596

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tigrannajaryan opened this issue Nov 21, 2022 · 4 comments · Fixed by #6833
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@tigrannajaryan
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tigrannajaryan commented Nov 21, 2022

To implement OpAMP for the Collector we need a way for extensions to know what is the current effective configuration of the Collector, see the [design document](https://docs.google.com/document/d/1KtH5atZQUs9Achbce6LiOaJxLbksNJenvgvyKLsJrkc/edit#heading=h.ioikt02qpy5f.

This can be implemented as an optional interface that extensions can implement to be notified of the current config.

The config must be reported immediately after the extensions are started and then every time the config changes as a result of ConfigProvider reloads.

@evan-bradley
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I can work on this.

@tigrannajaryan
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@evan-bradley feel free to add me a as a reviewer on all OpAMP-related PRs.

@bogdandrutu
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This can be implemented as an optional interface that extensions can implement to be notified of the current config.

Why not an optional interface on the Host? I would like to determine when to do one or the other.

@evan-bradley
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Why not an optional interface on the Host? I would like to determine when to do one or the other.

I would like to use a push-based model for this so in the future the Host can update extensions that persist across configuration updates. Even if that doesn't happen anytime soon, having the Host push updates to extensions is not much more complex than having extensions call a method on the Host to get the effective configuration.

To notify extensions, we will either need to provide an interface on the Host that allows extensions to register message handlers, or allow the Host to call a method on extensions that want to be notified of updates. I think having an optional interface for extensions will provide the simplest solution. This also matches the approach to host-component communication for component status reporting in #6560.

dmitryax pushed a commit that referenced this issue Aug 8, 2023
**Description:**

This adds an optional `ConfigWatcher` interface that extensions can
implement if they want to be notified of the effective configuration
that is used by the Collector.

I don't feel very strongly about any of the decisions I made in this PR,
so I am open to input if we would like to take a different approach
anywhere. I will leave some comments to explain the decisions I made.

**Link to tracking Issue:**
Closes
#6596

**Testing:**

I've made minimal unit test changes, but I expect to write more tests
once there is consensus on the direction for implementing this
functionality. I have done some manual testing to show that an extension
can get a YAML representation of the effective config using two YAML
input files.

---------

Co-authored-by: Evan Bradley <[email protected]>
evan-bradley pushed a commit to open-telemetry/opentelemetry-collector-contrib that referenced this issue Oct 26, 2023
See [design
document](https://docs.google.com/document/d/1KtH5atZQUs9Achbce6LiOaJxLbksNJenvgvyKLsJrkc/edit#heading=h.ioikt02qpy5f).

Depends on:

- [Implement ability for extensions to be notified about effective
configuration opentelemetry-collector#6596](open-telemetry/opentelemetry-collector#6596)
- [Make service.instance.id and other telemetry attributes available to
extensions opentelemetry-collector#6599](open-telemetry/opentelemetry-collector#6599)

Closes
#16618

---------

Signed-off-by: Sean Porter <[email protected]>
Co-authored-by: Daniel Jaglowski <[email protected]>
Co-authored-by: Tigran Najaryan <[email protected]>
sigilioso pushed a commit to carlossscastro/opentelemetry-collector-contrib that referenced this issue Oct 27, 2023
See [design
document](https://docs.google.com/document/d/1KtH5atZQUs9Achbce6LiOaJxLbksNJenvgvyKLsJrkc/edit#heading=h.ioikt02qpy5f).

Depends on:

- [Implement ability for extensions to be notified about effective
configuration opentelemetry-collector#6596](open-telemetry/opentelemetry-collector#6596)
- [Make service.instance.id and other telemetry attributes available to
extensions opentelemetry-collector#6599](open-telemetry/opentelemetry-collector#6599)

Closes
open-telemetry#16618

---------

Signed-off-by: Sean Porter <[email protected]>
Co-authored-by: Daniel Jaglowski <[email protected]>
Co-authored-by: Tigran Najaryan <[email protected]>
jmsnll pushed a commit to jmsnll/opentelemetry-collector-contrib that referenced this issue Nov 12, 2023
See [design
document](https://docs.google.com/document/d/1KtH5atZQUs9Achbce6LiOaJxLbksNJenvgvyKLsJrkc/edit#heading=h.ioikt02qpy5f).

Depends on:

- [Implement ability for extensions to be notified about effective
configuration opentelemetry-collector#6596](open-telemetry/opentelemetry-collector#6596)
- [Make service.instance.id and other telemetry attributes available to
extensions opentelemetry-collector#6599](open-telemetry/opentelemetry-collector#6599)

Closes
open-telemetry#16618

---------

Signed-off-by: Sean Porter <[email protected]>
Co-authored-by: Daniel Jaglowski <[email protected]>
Co-authored-by: Tigran Najaryan <[email protected]>
RoryCrispin pushed a commit to ClickHouse/opentelemetry-collector-contrib that referenced this issue Nov 24, 2023
See [design
document](https://docs.google.com/document/d/1KtH5atZQUs9Achbce6LiOaJxLbksNJenvgvyKLsJrkc/edit#heading=h.ioikt02qpy5f).

Depends on:

- [Implement ability for extensions to be notified about effective
configuration opentelemetry-collector#6596](open-telemetry/opentelemetry-collector#6596)
- [Make service.instance.id and other telemetry attributes available to
extensions opentelemetry-collector#6599](open-telemetry/opentelemetry-collector#6599)

Closes
open-telemetry#16618

---------

Signed-off-by: Sean Porter <[email protected]>
Co-authored-by: Daniel Jaglowski <[email protected]>
Co-authored-by: Tigran Najaryan <[email protected]>
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