Merge cockroachdb#123522 cockroachdb#124493

123522: dbconsole: overload page improvements r=sumeerbhola a=aadityasondhi

This PR contains a series of improvements to the overload page of the DB console as part of cockroachdb#121574. It is separated into multiple commits for ease of review.

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dbconsole: remove non useful charts on the overload page

In investigations, we have found that the following charts are not
useful and frequently cause confusion:
- Admission work rate
- Admission Delay rate
- Requests Waiting For Flow Tokens

Informs cockroachdb#121572

Release note (ui change): This patch removes "Admission Delay Rate",
"Admission Work Rate", and "Requests Waiting For Flow Tokens". These
charts often cause confusion and are not useful for general overload
investigations.

___

dbconsole: reorder overload page metrics for better readability

This patch reorders the existing metrics in a more usable order:
1. Metrics to help determine which resource is constrained (IO, CPU)
2. Metrics to narrow down which AC queues are seeing requests waiting
3. More advanced metrics about the system health (goroutine scheduler,
   L0 sublevels, etc.)

Informs cockroachdb#121572.

Release note (ui change): Reordering of metrics on the overload page to
help categorizing them better. They are roughly in the following order:
1. Metrics to help determine which resource is constrained (IO, CPU)
2. Metrics to narrow down which AC queues are seeing requests waiting
3. More advanced metrics about the system health (goroutine scheduler,
   L0 sublevels, etc.)

___

dbconsole: include better names and descriptions for overload page
This patch improves the metric descriptions for the metrics on the
overload page.

Fixes cockroachdb#120853.

Release note (ui change): The overload page now includes descriptions for all
metrics.

___

dbconsole: additional higher granularity metrics for overload

This patch adds additional metrics to the overload page that allow for
more granular look at the system:
- cr.store.storage.l0-sublevels
- cr.node.go.scheduler_latency-p99.9

Informs cockroachdb#121572.

Release note (ui change): Two additional metrics on the overload page
for better visibility into overloaded resources:
- cr.store.storage.l0-sublevels
- cr.node.go.scheduler_latency-p99.9

___

dbconsole: split Admission Queue graphs to avoid overcrowding

Informs cockroachdb#121572.

Release note (ui change): There are now 4 graphs for Admission Queue
Delay:
1. Foreground (regular) CPU work
2. Store (IO) work
3. Background (elastic) CPU work
4. Replication Admission Control, store overload on replicas

___

dbconsole: add elastic store metric to the overload page 

This patch uses the new sperated `elastic-stores` metrics for queing
delay from cockroachdb#123890.

Informs cockroachdb#121572.

Release note (ui change): The `Admission Queueing Delay – Store` chart
now separates elastic (background) work from the regular foreground
work.

___

dbconsole: add elastic io token exhausted duration to overload page 

This patch adds the metric `elastic_io_tokens_exhausted_duration.kv`
introduced in cockroachdb#124078.

Informs cockroachdb#121572.

Release note (ui change): The `Admission IO Tokens Exhausted` chart now
separates elastic and regular io work.

124493: packer: only try emulating via Docker on x86 r=rail a=rickystewart

Epic: none

Release note: None

Co-authored-by: Aaditya Sondhi <[email protected]>
Co-authored-by: Ricky Stewart <[email protected]>

build/packer/teamcity-agent.sh

@@ -65,8 +65,10 @@ apt-get install --yes \
 apt-get install --yes qemu binfmt-support qemu-user-static
 
 # Verify that both of the platforms we support Docker for can be built.
-docker run --attach=stdout --attach=stderr --platform=linux/amd64 --rm --pull=always registry.access.redhat.com/ubi9/ubi-minimal uname -p
-docker run --attach=stdout --attach=stderr --platform=linux/arm64 --rm --pull=always registry.access.redhat.com/ubi9/ubi-minimal uname -p
+if [[ $ARCH = x86_64 ]]; then
+    docker run --attach=stdout --attach=stderr --platform=linux/amd64 --rm --pull=always registry.access.redhat.com/ubi9/ubi-minimal uname -p
+    docker run --attach=stdout --attach=stderr --platform=linux/arm64 --rm --pull=always registry.access.redhat.com/ubi9/ubi-minimal uname -p
+fi
 
 case $ARCH in
     x86_64) WHICH=x86_64; SHASUM=97bf730372f9900b2dfb9206fccbcf92f5c7f3b502148b832e77451aa0f9e0e6 ;;