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add only_metrics, diff_values and derived_values. docs: clarify usage

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brinkcoder 2025-03-05 00:58:29 +01:00
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collectors/customCmdMetric.md
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@ -36,12 +36,12 @@ mem_usage,host=myhost,type=node,unit=MByte value=1024 1670000000000000000
The following tags are commonly used:
- **type:** Indicates the metric scope, e.g. "node", "socket" or "hwthread".
- **type-id:** The identifier for the type (e.g. the specific hardware thread or socket).
- **unit:** The unit of the metric (e.g. "MByte").
- **unit:** The unit of the metric (e.g. "MByte").
For each metric parsed from the output:
- If `send_abs_values` is enabled, the **absolute (raw) metric** is forwarded.
- If `send_diff_values` is enabled and a previous value exists, the collector computes the **difference** (current value minus previous value) and forwards it as a new metric with the suffix `_diff`.
- If `send_derived_values` is enabled and a previous value exists, the collector computes the **derived rate** (difference divided by the time interval) and forwards it as a new metric with the suffix `_rate`.
- If `send_derived_values` is enabled and a previous value exists, the collector computes the **derived rate** (difference divided by the time interval) and forwards it as a new metric with the suffix `_rate`.
Additionally, if the original metric includes a unit (in its meta data or tags), the derived metric's unit is set to that unit with "/s" appended.
Both filtering mechanisms are supported: