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Add info on soft memory limits (#3672) 

* add info on soft memory limits

Signed-off-by: Filinto Duran <filinto@diagrid.io>

* add mention about the allowed suffixes

Signed-off-by: Filinto Duran <filinto@diagrid.io>

* make format similar to other annotations format

Signed-off-by: Filinto Duran <filinto@diagrid.io>

* Update daprdocs/content/en/operations/hosting/kubernetes/kubernetes-production.md

Co-authored-by: Mark Fussell <markfussell@gmail.com>
Signed-off-by: Filinto Duran <duranto@gmail.com>

* Update daprdocs/content/en/operations/hosting/kubernetes/kubernetes-production.md

Co-authored-by: Mark Fussell <markfussell@gmail.com>
Signed-off-by: Filinto Duran <duranto@gmail.com>

* Update daprdocs/content/en/operations/hosting/kubernetes/kubernetes-production.md

Co-authored-by: Mark Fussell <markfussell@gmail.com>
Signed-off-by: Filinto Duran <duranto@gmail.com>

* Update daprdocs/content/en/operations/hosting/kubernetes/kubernetes-production.md

Co-authored-by: Mark Fussell <markfussell@gmail.com>
Signed-off-by: Filinto Duran <duranto@gmail.com>

* Update daprdocs/content/en/operations/hosting/kubernetes/kubernetes-production.md

Co-authored-by: Mark Fussell <markfussell@gmail.com>
Signed-off-by: Filinto Duran <duranto@gmail.com>

* Update daprdocs/content/en/operations/hosting/kubernetes/kubernetes-production.md

Co-authored-by: Mark Fussell <markfussell@gmail.com>
Signed-off-by: Filinto Duran <duranto@gmail.com>

* Update daprdocs/content/en/operations/hosting/kubernetes/kubernetes-production.md

Co-authored-by: Mark Fussell <markfussell@gmail.com>
Signed-off-by: Filinto Duran <duranto@gmail.com>

* Update daprdocs/content/en/operations/hosting/kubernetes/kubernetes-production.md

Signed-off-by: Mark Fussell <markfussell@gmail.com>

---------

Signed-off-by: Filinto Duran <filinto@diagrid.io>
Signed-off-by: Filinto Duran <duranto@gmail.com>
Signed-off-by: Mark Fussell <markfussell@gmail.com>
Co-authored-by: Mark Fussell <markfussell@gmail.com>
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@ -68,6 +68,28 @@ Since Dapr is intended to do much of the I/O heavy lifting for your app, it's ex
The CPU and memory limits above account for the fact that Dapr is intended to support a high number of I/O bound operations. It is strongly recommended that you use a monitoring tool to get a baseline for the sidecar (and app) containers and tune these settings based on those baselines.
### Setting soft memory limits on Dapr sidecar
It is recommended to set soft memory limits on the Dapr sidecar when you have set up memory limits.
This allows the sidecar garbage collector to free up memory when the memory usage is above the limit instead of
waiting to be double of the last amount of memory present in the heap when it was run, which is the default behavior
of the [garbage collector](https://tip.golang.org/doc/gc-guide#Memory_limit) used in Go, and can lead to OOM Kill events.
For example, for an app with app-id `nodeapp`, if you have set your memory limit to be 1000Mi as mentioned above, you can use the following in your pod annotations:
```yaml
annotations:
dapr.io/enabled: "true"
dapr.io/app-id: "nodeapp"
# our daprd memory settings
dapr.io/sidecar-memory-limit: "1000Mi" # your memory limit
dapr.io/env: "GOMEMLIMIT=900MiB" # 90% of your memory limit. Also notice the suffix "MiB" instead of "Mi"
```
In this example, the soft limit has been set to be 90% as recommended in [garbage collector tips](https://tip.golang.org/doc/gc-guide#Memory_limit) where it is recommend to leave 5-10% for other services.
The `GOMEMLIMIT` environment variable [allows](https://pkg.go.dev/runtime) certain suffixes for the memory size: `B, KiB, MiB, GiB, and TiB.`
## Highly-available mode
When deploying Dapr in a production-ready configuration, it is recommend to deploy with a highly available (HA) configuration of the control plane, which creates 3 replicas of each control plane pod in the dapr-system namespace. This configuration allows the Dapr control plane to retain 3 running instances and survive individual node failures and other outages.