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.

1 files changed, 3 insertions, 8 deletions

diff --git a/opendc-experiments/opendc-experiments-capelin/src/test/kotlin/org/opendc/experiments/capelin/CapelinIntegrationTest.kt b/opendc-experiments/opendc-experiments-capelin/src/test/kotlin/org/opendc/experiments/capelin/CapelinIntegrationTest.kt
index 62cdf123..fa2cd9c8 100644
--- a/opendc-experiments/opendc-experiments-capelin/src/test/kotlin/org/opendc/experiments/capelin/CapelinIntegrationTest.kt
+++ b/opendc-experiments/opendc-experiments-capelin/src/test/kotlin/org/opendc/experiments/capelin/CapelinIntegrationTest.kt
@@ -33,14 +33,13 @@ import org.opendc.compute.service.scheduler.filters.RamFilter
 import org.opendc.compute.service.scheduler.filters.VCpuFilter
 import org.opendc.compute.service.scheduler.weights.CoreRamWeigher
 import org.opendc.compute.workload.*
-import org.opendc.compute.workload.telemetry.NoopTelemetryManager
+import org.opendc.compute.workload.telemetry.ComputeMetricReader
+import org.opendc.compute.workload.telemetry.ComputeMonitor
+import org.opendc.compute.workload.telemetry.table.HostTableReader
 import org.opendc.compute.workload.topology.Topology
 import org.opendc.compute.workload.topology.apply
 import org.opendc.experiments.capelin.topology.clusterTopology
 import org.opendc.simulator.core.runBlockingSimulation
-import org.opendc.telemetry.compute.ComputeMetricReader
-import org.opendc.telemetry.compute.ComputeMonitor
-import org.opendc.telemetry.compute.table.HostTableReader
 import java.io.File
 import java.time.Duration
 import java.util.*
@@ -86,7 +85,6 @@ class CapelinIntegrationTest {
         val runner = ComputeServiceHelper(
             coroutineContext,
             clock,
-            NoopTelemetryManager(),
             computeScheduler
         )
         val topology = createTopology()
@@ -136,7 +134,6 @@ class CapelinIntegrationTest {
         val runner = ComputeServiceHelper(
             coroutineContext,
             clock,
-            NoopTelemetryManager(),
             computeScheduler
         )
         val topology = createTopology("single")
@@ -182,7 +179,6 @@ class CapelinIntegrationTest {
         val simulator = ComputeServiceHelper(
             coroutineContext,
             clock,
-            NoopTelemetryManager(),
             computeScheduler,
             interferenceModel = interferenceModel?.withSeed(seed.toLong())
         )
@@ -226,7 +222,6 @@ class CapelinIntegrationTest {
         val simulator = ComputeServiceHelper(
             coroutineContext,
             clock,
-            NoopTelemetryManager(),
             computeScheduler,
             grid5000(Duration.ofDays(7))
         )