Not every module contributes to every runtime.

The core-runtime module defines each runtime:

- The target JVM for the runtime. Each runtime has its own JVM compatibility constraints.
- Some base services that are available to code hosted by the runtime. This varies by runtime.

```Python
some_var = ContextVar("some_var", default="default value")
```

To set a value used in the current "context" (e.g. for the current request) use:

```Python
some_var.set("new value")
```

To get a value anywhere inside of the context (e.g. in any part handling the current request) use:

```Python
some_var.get()
```

// is set.
func (c Config) getTargetKVS(subSys, target string, redactSecrets bool) KVS {
	store, ok := c[subSys]
	if !ok {
		return nil
	}

	// Lookup will succeed, because this function only works with valid subSys
	// values.
	resultKVS := make([]KV, 0, len(store[target]))
	hkvs := HelpSubSysMap[subSys]
	for _, kv := range store[target] {
		hkv, _ := hkvs.Lookup(kv.Key)

When deploying applications you will probably want to have some **replication of processes** to take advantage of **multiple cores** and to be able to handle more requests.

As you saw in the previous chapter about [Deployment Concepts](concepts.md){.internal-link target=_blank}, there are multiple strategies you can use.

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *

~~ Licensed to the Apache Software Foundation (ASF) under one
~~ or more contributor license agreements.  See the NOTICE file
~~ distributed with this work for additional information
~~ regarding copyright ownership.  The ASF licenses this file
~~ to you under the Apache License, Version 2.0 (the
~~ "License"); you may not use this file except in compliance
~~ with the License.  You may obtain a copy of the License at
~~
~~ http://www.apache.org/licenses/LICENSE-2.0

// Name - returns the Name of the target.
func (target *MySQLTarget) Name() string {
	return target.ID().String()
}

// Store returns any underlying store if set.
func (target *MySQLTarget) Store() event.TargetStore {
	return target.store
}

// IsActive - Return true if target is up and active
func (target *MySQLTarget) IsActive() (bool, error) {
	if err := target.init(); err != nil {
		return false, err
	}

message DaemonSet {
  // Standard object's metadata.
  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;

  // The desired behavior of this daemon set.
  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status

```Python
{
    "text": "Some note",
    "completed": False,
}
```

but it doesn't have the `id` field.

So we create a new `dict`, that contains the key-value pairs from `note.dict()` with:

```Python
{**note.dict()}
```

`**note.dict()` "unpacks" the key value pairs directly, so, `{**note.dict()}` would be, more or less, a copy of `note.dict()`.

 * core properties defined in {@link org.eclipse.aether.artifact.ArtifactProperties}.
 *
 * @see org.eclipse.aether.artifact.ArtifactProperties
 * @since 4.0.0
 */
public final class MavenArtifactProperties {
    /**
     * A boolean flag indicating whether the artifact presents some kind of bundle that physically includes its
     * dependencies, e.g. a fat WAR.