merge: Move OpenTelemetry integration outside core modules (#81)

This change removes the OpenTelemetry integration from the OpenDC 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 #80) 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.

## Implementation Notes :hammer_and_pick:

* Remove OpenTelemetry from "compute" modules 
* Remove OpenTelemetry from "workflow" modules 
* Remove OpenTelemetry from "FaaS" modules
* Remove OpenTelemetry from TF20 experiment 
* Remove dependency on OpenTelemetry SDK 

## External Dependencies :four_leaf_clover:

* N/A

## Breaking API Changes :warning:

* Metrics are not anymore directly exposed via OpenTelemetry. Instead, an adapter needs to be used to access the data via OpenTelemetry.

3 files changed, 4 insertions, 8 deletions

diff --git a/opendc-web/opendc-web-runner/build.gradle.kts b/opendc-web/opendc-web-runner/build.gradle.kts
index 3c80f605..c1e3b976 100644
--- a/opendc-web/opendc-web-runner/build.gradle.kts
+++ b/opendc-web/opendc-web-runner/build.gradle.kts
@@ -37,8 +37,6 @@ dependencies {
     implementation(projects.opendcCompute.opendcComputeSimulator)
     implementation(projects.opendcCompute.opendcComputeWorkload)
     implementation(projects.opendcSimulator.opendcSimulatorCore)
-    implementation(projects.opendcTelemetry.opendcTelemetrySdk)
-    implementation(projects.opendcTelemetry.opendcTelemetryCompute)
     implementation(projects.opendcTrace.opendcTraceApi)
     implementation(projects.opendcWeb.opendcWebClient)
 
diff --git a/opendc-web/opendc-web-runner/src/main/kotlin/org/opendc/web/runner/OpenDCRunner.kt b/opendc-web/opendc-web-runner/src/main/kotlin/org/opendc/web/runner/OpenDCRunner.kt
index 7c0c43ed..9c9a866d 100644
--- a/opendc-web/opendc-web-runner/src/main/kotlin/org/opendc/web/runner/OpenDCRunner.kt
+++ b/opendc-web/opendc-web-runner/src/main/kotlin/org/opendc/web/runner/OpenDCRunner.kt
@@ -25,7 +25,7 @@ package org.opendc.web.runner
 import mu.KotlinLogging
 import org.opendc.compute.api.Server
 import org.opendc.compute.workload.*
-import org.opendc.compute.workload.telemetry.NoopTelemetryManager
+import org.opendc.compute.workload.telemetry.ComputeMetricReader
 import org.opendc.compute.workload.topology.HostSpec
 import org.opendc.compute.workload.topology.Topology
 import org.opendc.compute.workload.topology.apply
@@ -36,7 +36,6 @@ import org.opendc.simulator.compute.model.ProcessingUnit
 import org.opendc.simulator.compute.power.LinearPowerModel
 import org.opendc.simulator.compute.power.SimplePowerDriver
 import org.opendc.simulator.core.runBlockingSimulation
-import org.opendc.telemetry.compute.ComputeMetricReader
 import org.opendc.web.client.runner.OpenDCRunnerClient
 import org.opendc.web.proto.runner.Job
 import org.opendc.web.proto.runner.Scenario
@@ -209,7 +208,6 @@ public class OpenDCRunner(
                     val simulator = ComputeServiceHelper(
                         coroutineContext,
                         clock,
-                        NoopTelemetryManager(),
                         computeScheduler,
                         failureModel,
                         interferenceModel.takeIf { phenomena.interference }
diff --git a/opendc-web/opendc-web-runner/src/main/kotlin/org/opendc/web/runner/internal/WebComputeMonitor.kt b/opendc-web/opendc-web-runner/src/main/kotlin/org/opendc/web/runner/internal/WebComputeMonitor.kt
index 69350d8c..01002c70 100644
--- a/opendc-web/opendc-web-runner/src/main/kotlin/org/opendc/web/runner/internal/WebComputeMonitor.kt
+++ b/opendc-web/opendc-web-runner/src/main/kotlin/org/opendc/web/runner/internal/WebComputeMonitor.kt
@@ -22,9 +22,9 @@
 
 package org.opendc.web.runner.internal
 
-import org.opendc.telemetry.compute.ComputeMonitor
-import org.opendc.telemetry.compute.table.HostTableReader
-import org.opendc.telemetry.compute.table.ServiceTableReader
+import org.opendc.compute.workload.telemetry.ComputeMonitor
+import org.opendc.compute.workload.telemetry.table.HostTableReader
+import org.opendc.compute.workload.telemetry.table.ServiceTableReader
 import kotlin.math.max
 import kotlin.math.roundToLong