update readme to fit semconv naming

Author: SylvainJuge

instrumentation/jmx-metrics/README.md

@@ -245,53 +245,53 @@ rules:
         metric: tomcat.connector.status
         metricAttribute:
           port: param(port)
-          connector_state:
+          tomcat.connector.state:
             ok: STARTED
             failed: [STOPPED,FAILED]
             degraded: '*'
 ```
 
-For a given value of `port`, let's say `8080` This will capture the `tomcat.connector.status` metric of type `updowncounter` with value `0` or `1` and the `connector_state` metric attribute will have a value in [`ok`,`failed`,`degraded`].
-For every sample, 3 metrics will be captured for each value of `connector_state` depending on the value of `stateName`:
+For a given value of `port`, let's say `8080` This will capture the `tomcat.connector.status` metric of type `updowncounter` with value `0` or `1` and the `tomcat.connector.state` metric attribute will have a value in [`ok`,`failed`,`degraded`].
+For every sample, 3 metrics will be captured for each value of `tomcat.connector.state` depending on the value of `stateName`:
 
 When `stateName` = `STARTED`, we have:
 
-- `tomcat.connector.status` value = `1`, attributes `port` = `8080` and `connector_state` = `ok`
-- `tomcat.connector.status` value = `0`, attributes `port` = `8080` and `connector_state` = `failed`
-- `tomcat.connector.status` value = `0`, attributes `port` = `8080` and `connector_state` = `degraded`
+- `tomcat.connector.status` value = `1`, attributes `port` = `8080` and `tomcat.connector.state` = `ok`
+- `tomcat.connector.status` value = `0`, attributes `port` = `8080` and `tomcat.connector.state` = `failed`
+- `tomcat.connector.status` value = `0`, attributes `port` = `8080` and `tomcat.connector.state` = `degraded`
 
 When `stateName` = `STOPPED` or `FAILED`, we have:
 
-- `tomcat.connector.status` value = `0`, attributes `port` = `8080` and `connector_state` = `ok`
-- `tomcat.connector.status` value = `1`, attributes `port` = `8080` and `connector_state` = `failed`
-- `tomcat.connector.status` value = `0`, attributes `port` = `8080` and `connector_state` = `degraded`
+- `tomcat.connector.status` value = `0`, attributes `port` = `8080` and `tomcat.connector.state` = `ok`
+- `tomcat.connector.status` value = `1`, attributes `port` = `8080` and `tomcat.connector.state` = `failed`
+- `tomcat.connector.status` value = `0`, attributes `port` = `8080` and `tomcat.connector.state` = `degraded`
 
 For other values of `stateName`, we have:
 
-- `tomcat.connector.status` value = `0`, attributes `port` = `8080` and `connector_state` = `ok`
-- `tomcat.connector.status` value = `0`, attributes `port` = `8080` and `connector_state` = `failed`
-- `tomcat.connector.status` value = `1`, attributes `port` = `8080` and `connector_state` = `degraded`
+- `tomcat.connector.status` value = `0`, attributes `port` = `8080` and `tomcat.connector.state` = `ok`
+- `tomcat.connector.status` value = `0`, attributes `port` = `8080` and `tomcat.connector.state` = `failed`
+- `tomcat.connector.status` value = `1`, attributes `port` = `8080` and `tomcat.connector.state` = `degraded`
 
 Each state key can be mapped to one or more values of the MBean attribute using:
 - a string literal or a string array
 - a `*` character to provide default option and avoid enumerating all values, this value must be quoted in YAML
 
 Exactly one `*` value must be present in the mapping to ensure all possible values of the MBean attribute can be mapped to a state key.
 
-The default value indicated by `*` does not require a dedicated state key. For example, if we want to have `connector_state` metric attribute with values `on` or `off`, we can use:
+The default value indicated by `*` does not require a dedicated state key. For example, if we want to have `tomcat.connector.state` metric attribute with values `on` or `off`, we can use:
 ```yaml
-          connector_state:
+          tomcat.connector.state:
             on: STARTED
             off: [STOPPED,FAILED,'*']
 ```
 In the particular case where only two values are defined, we can simplify further by explicitly defining one state and rely on default for the other.
 ```yaml
-          connector_state:
+          tomcat.connector.state:
             on: STARTED
             off: '*'
 ```
 
-State metrics do not have a unit (nor source unit) and use an empty string `""` as unit.
+State metrics do not need to define `unit` nor `sourceUnit` attributes, the unit of the metric will always be `1`.
 
 ### Metric attributes modifiers