[extension/observer, receiver/dockerstats] Correct examples with api_version (open-telemetry#33992)

Changes examples for `api_version` to make sure they use a string
instead of a float

**Link to tracking Issue:** Required for
open-telemetry/opentelemetry-collector/pull/10554

Author: mx-psi

extension/observer/dockerobserver/README.md

@@ -32,7 +32,7 @@ extensions:
     # list of container image names to exclude
     excluded_images: ['redis', 'another_image_name']
     # client API version, default to 1.24
-    api_version: 1.25
+    api_version: "1.25"
     # max amount of time to wait for a response from Docker API , default to 5s
     timeout: 15s
 
@@ -63,9 +63,9 @@ default: `5s`
 
 ### `api_version`
 
-The client API version. If using one with a terminating zero, input as a string to prevent undesired truncation (e.g. `"1.40"` instead of `1.40`, which is parsed as `1.4`).
+The client API version. Make sure you input it as a string instead of a float (e.g. `"1.4"` instead of `1.4`).
 
-default: `1.24`
+default: `"1.24"`
 
 ### `excluded_images`
 

extension/observer/dockerobserver/config_test.go

@@ -43,16 +43,6 @@ func TestLoadConfig(t *testing.T) {
 				DockerAPIVersion:      version,
 			},
 		},
-		{
-			id: component.NewIDWithName(metadata.Type, "unsupported_api_version"),
-			expected: &Config{
-				Endpoint:          "unix:///var/run/docker.sock",
-				CacheSyncInterval: time.Hour,
-				Timeout:           5 * time.Second,
-				DockerAPIVersion:  "1.4",
-			},
-			expectedError: `"api_version" 1.4 must be at least 1.24`,
-		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.id.String(), func(t *testing.T) {

extension/observer/dockerobserver/testdata/config.yaml

@@ -16,6 +16,3 @@ docker_observer/ignore_non_host_bindings:
   ignore_non_host_bindings: true
 docker_observer/exclude_nginx:
   excluded_images: ["nginx"]
-docker_observer/unsupported_api_version:
-  # intentionally a float since it will be parsed as 1.4
-  api_version: 1.40

receiver/dockerstatsreceiver/README.md

@@ -40,7 +40,7 @@ only unmatched container image names should be excluded.
     - Globs are non-regex items (e.g. `/items/`) containing any of the following: `*[]{}?`.  Negations are supported:
     `!my*container` will exclude all containers whose image name doesn't match the blob `my*container`.
 - `timeout` (default = `5s`): The request timeout for any docker daemon query.
-- `api_version` (default = `1.25`): The Docker client API version (must be 1.25+). If using one with a terminating zero, input as a string to prevent undesired truncation (e.g. `"1.40"` instead of `1.40`, which is parsed as `1.4`). [Docker API versions](https://docs.docker.com/engine/api/).
+- `api_version` (default = `"1.25"`): The Docker client API version (must be 1.25+). Must be input as a string, not a float (e.g. `"1.40"` instead of `1.40`). [Docker API versions](https://docs.docker.com/engine/api/).
 - `metrics` (defaults at [./documentation.md](./documentation.md)): Enables/disables individual metrics. See [./documentation.md](./documentation.md) for full detail.
 
 Example:
@@ -51,7 +51,7 @@ receivers:
     endpoint: http://example.com/
     collection_interval: 2s
     timeout: 20s
-    api_version: 1.24
+    api_version: "1.24"
     container_labels_to_metric_labels:
       my.container.label: my-metric-label
       my.other.container.label: my-other-metric-label