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Add memory metrics
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‎metrics/SystemMetrics.md‎

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@@ -7,27 +7,30 @@ TODO: Add list of supported platforms.
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## Common metrics collection
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These are some default metrics supported by OpenCensus system metrics package/contrib. This is to ensure consistency across language implementations, as far as practical.
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| Metric Name | Unit | Type | Description | Labels |
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|-------------------------------------------|-------|----------------------------|-----------------------------------------------------------------------------------------------|-----------------|
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| system/cpu_seconds/total | s | Int64 Cumulative | Total kernel/system user CPU in seconds. | Hostname, Mode |
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| system/processes/created | 1 | Int64 Cumulative | Total number of times a process was created. | Hostname |
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| system/processes/running | 1 | Int64 Gauge | Total number of running processes. | Hostname |
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| system/disk/total | By | Int64 Gauge | The total available system disk space in bytes. | Hostname, Volume |
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| system/disk/used | By | Int64 Gauge | The total used system disk space in bytes. | Hostname, Volume |
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| process/heap/total | By | Int64 Gauge | The process's total allocated heap size in bytes. | Hostname |
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| process/heap/used | By | Int64 Gauge | The process's total used heap size in bytes. | Hostname |
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| process/memory/rss | By | Int64 Gauge | Resident memory size in bytes. | Hostname |
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| process/file_descriptor/max | 1 | Int64 Gauge | The maximum limit of file descriptor count. | Hostname |
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| process/file_descriptor/open | 1 | Int64 Gauge | The number of open file descriptor count. | Hostname |
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| process/start_time | s | Int64 Cumulative | The start time of the process since unix epoch in seconds. | Hostname |
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| process/cpu/usage | s | Int64 Cumulative | The total user and system CPU time spent in seconds. | Hostname |
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| Metric Name | Unit | Type | Description | Labels |
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|-------------------------------------------|-------|----------------------------|--------------------------------------------------------------------|-------------------------|
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| system/cpu_seconds/total | s | Int64 Cumulative | Total kernel/system user CPU in seconds. | Hostname, Mode |
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| system/processes/created | 1 | Int64 Cumulative | Total number of times a process was created. | Hostname |
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| system/processes/running | 1 | Int64 Gauge | Total number of running processes. | Hostname |
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| system/processes/blocked | 1 | Int64 Gauge | Total number of blocked processes. | Hostname |
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| system/memory/total | By | Int64 Gauge | Total system memory capacity in bytes. | Hostname |
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| system/memory/free | By | Int64 Gauge | Total free system memory in bytes. | Hostname |
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| system/memory/used | By | Int64 Gauge | Total used system memory in bytes. | Hostname |
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| system/disk/total | By | Int64 Gauge | The total available system disk space in bytes. | Hostname, Volume |
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| system/disk/used | By | Int64 Gauge | The total used system disk space in bytes. | Hostname, Volume |
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| process/memory/rss | By | Int64 Gauge | Resident memory size in bytes. | Hostname |
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| process/file_descriptor/max | 1 | Int64 Gauge | The maximum limit of file descriptor count. | Hostname |
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| process/file_descriptor/open | 1 | Int64 Gauge | The number of open file descriptor count. | Hostname |
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| process/heap/total | By | Int64 Gauge | The process's total allocated heap size in bytes. | Hostname |
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| process/heap/used | By | Int64 Gauge | The process's total used heap size in bytes. | Hostname |
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| process/cpu/usage | s | Int64 Cumulative | The total user and system CPU time spent in seconds. | Hostname |
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### Labels
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The label keys associated with the above metrics.
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| Label Key | Description |
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|--------------------|----------------------------------------------------------------------------------------------------------|
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| Mode | The amount of time spent by the CPU in state (i.e. `user, nice, system, idle, iowait`). |
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| Mode | The amount of time spent by the CPU in state (i.e. `user, nice, system, idle, iowait, stolen`). |
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| Volume | The path the fs is mounted on (i.e. `/, /data`) |
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| Hostname | The hostname of the host (i.e. `opencensus-test`). |
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