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This change removes the dependency on the OpenTelemetry SDK. Instead,
we'll only expose metrics via the OpenTelemetry API in the future via
adapter classes.
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This change removes the OpenTelemetry integration from the OpenDC
Compute modules. Previously, we chose to integrate OpenTelemetry to
provide a unified way to report metrics to the users.
Although this worked as expected, the overhead of the OpenTelemetry when
collecting metrics during simulation was considerable and lacked more
optimization opportunities (other than providing a separate API
implementation). Furthermore, since we were tied to OpenTelemetry's SDK
implementation, we experienced issues with throttling and registering
multiple instruments.
We will instead use another approach, where we expose the core metrics
in OpenDC via specialized interfaces (see the commits before) such that
access is fast and can be done without having to interface with
OpenTelemetry. In addition, we will provide an adapter to that is able
to forward these metrics to OpenTelemetry implementations, so we can
still integrate with the wider ecosystem.
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This change introduces a `ComputeMetricReader` class that can be used as
a replacement for the `CoroutineMetricReader` class when reading metrics
from the Compute service. This implementation operates directly on a
`ComputeService` instance, providing better performance.
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This change updates the Gradle build configuration of the project to
publish the different type of modules (e.g., opendc-compute,
opendc-simulator) into their own groups.
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This change fixes an issue with the CPU time aggregation for VMs in the
ComputeMetricAggregator, leading to incorrect values.
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This change removes the opendc-platform module from the project. This
module represented a Java platform which was previously used for sharing
a set of dependency versions between subprojects. However, with the
version catalogue that was added by Gradle, we currently do not use the
platform anymore.
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This change updates the OpenDC codebase to use OpenTelemetry v1.11,
which stabilizes the metrics API. This stabilization brings quite a few
breaking changes, so significant changes are necessary inside the OpenDC
codebase.
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This change redesigns the ComputeMonitor interface to reduce the number
of memory allocations necessary during a collection cycle.
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This change adds support for collecting the provisioning time of virtual
machines in addition to their boot time.
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This commit changes the lookup for host and server aggregators to use
`getOrPut` instead of `computeIfAbsent`. The former will inline the
lambda and not cause any memory allocation in the fast-path (e.g., the
key exists), while the latter always allocates lambda for constructing
the aggregator.
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This change updates the Clock adapter for OpenTelemetry to return the
current time in nanoseconds as specified by the method contract (as
opposed to milliseconds).
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This change drops the requirement for a clock parameter when
constructing a ComputeMetricExporter, since it will now derive the
timestamp from the recorded metrics.
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This change updates the CoroutineMetricReader to ensure that the
exporter is shutdown when the metric reader fails or is shutdown.
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This change standardizes the metrics emitted by SimHost instances and
their guests based on the OpenTelemetry semantic conventions. We now
also report CPU time as opposed to CPU work as this metric is more
commonly used.
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This change updates the OpenDC compute service implementation with
multiple meters that follow the OpenTelemetry conventions.
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This change refactors the telemetry implementation by creating a
separate MeterProvider per service or host. This means we have to keep
track of multiple metric producers, but that we can attach resource
information to each of the MeterProviders like we would in a real world
scenario.
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This change simplifies the CoroutineMetricReader implementation by
removing the seperation of reader and exporter jobs.
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This change updates the opentelemetry-java library to version 1.6.0.
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This change moves the metric collection outside the Capelin codebase in
a separate module so other modules can also benefit from the compute
metric collection code.
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This change adds support for the Gradle version catalog feature in our
build configuration. This allows us to have a single file,
gradle/libs.versions.toml, which contains all the dependency versions
used in this project.
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This change updates the build scripts to use type-safe project accessors
when specifying build dependencies between modules.
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This change updates the project structure to become flattened.
Previously, the simulator, frontend and API each lived into their own
directory.
With this change, all modules of the project live in the top-level
directory of the repository. This should improve discoverability of
modules of the project.
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