# LeoFS Input Plugin

The LeoFS plugin gathers metrics of LeoGateway, LeoManager, and LeoStorage using
SNMP. See [LeoFS Documentation / System Administration / System
Monitoring](https://leo-project.net/leofs/docs/admin/system_admin/monitoring/).

## Global configuration options <!-- @/docs/includes/plugin_config.md -->

In addition to the plugin-specific configuration settings, plugins support
additional global and plugin configuration settings. These settings are used to
modify metrics, tags, and field or create aliases and configure ordering, etc.
See the [CONFIGURATION.md][CONFIGURATION.md] for more details.

[CONFIGURATION.md]: ../../../docs/CONFIGURATION.md#plugins

## Configuration

```toml @sample.conf
# Read metrics from a LeoFS Server via SNMP
[[inputs.leofs]]
  ## An array of URLs of the form:
  ##   host [ ":" port]
  servers = ["127.0.0.1:4010"]
```

## Metrics

### Statistics specific to the internals of LeoManager

#### Erlang VM of LeoManager

- 1 min Statistics
  - num_of_processes
  - total_memory_usage
  - system_memory_usage
  - processes_memory_usage
  - ets_memory_usage
  - used_allocated_memory
  - allocated_memory
- 5 min Statistics
  - num_of_processes_5min
  - total_memory_usage_5min
  - system_memory_usage_5min
  - processes_memory_usage_5min
  - ets_memory_usage_5min
  - used_allocated_memory_5min
  - allocated_memory_5min

### Statistics specific to the internals of LeoStorage

### Erlang VM of LeoStorage

- 1 min Statistics
  - num_of_processes
  - total_memory_usage
  - system_memory_usage
  - processes_memory_usage
  - ets_memory_usage
  - used_allocated_memory
  - allocated_memory
- 5 min Statistics
  - num_of_processes_5min
  - total_memory_usage_5min
  - system_memory_usage_5min
  - processes_memory_usage_5min
  - ets_memory_usage_5min
  - used_allocated_memory_5min
  - allocated_memory_5min

### Total Number of Requests for LeoStorage

- 1 min Statistics
  - num_of_writes
  - num_of_reads
  - num_of_deletes
- 5 min Statistics
  - num_of_writes_5min
  - num_of_reads_5min
  - num_of_deletes_5min

#### Total Number of Objects and Total Size of Objects

- num_of_active_objects
- total_objects
- total_size_of_active_objects
- total_size

#### Total Number of MQ Messages

- num_of_replication_messages,
- num_of_sync-vnode_messages,
- num_of_rebalance_messages,
- mq_num_of_msg_recovery_node
- mq_num_of_msg_deletion_dir
- mq_num_of_msg_async_deletion_dir
- mq_num_of_msg_req_deletion_dir
- mq_mdcr_num_of_msg_req_comp_metadata
- mq_mdcr_num_of_msg_req_sync_obj

Note: The following items are available since LeoFS v1.4.0:

- mq_num_of_msg_recovery_node
- mq_num_of_msg_deletion_dir
- mq_num_of_msg_async_deletion_dir
- mq_num_of_msg_req_deletion_dir
- mq_mdcr_num_of_msg_req_comp_metadata
- mq_mdcr_num_of_msg_req_sync_obj

#### Data Compaction

- comp_state
- comp_last_start_datetime
- comp_last_end_datetime
- comp_num_of_pending_targets
- comp_num_of_ongoing_targets
- comp_num_of_out_of_targets

Note: The all items are available since LeoFS v1.4.0.

### Statistics specific to the internals of LeoGateway

#### Erlang VM of LeoGateway

- 1 min Statistics
  - num_of_processes
  - total_memory_usage
  - system_memory_usage
  - processes_memory_usage
  - ets_memory_usage
  - used_allocated_memory
  - allocated_memory
- 5 min Statistics
  - num_of_processes_5min
  - total_memory_usage_5min
  - system_memory_usage_5min
  - processes_memory_usage_5min
  - ets_memory_usage_5min
  - used_allocated_memory_5min
  - allocated_memory_5min

#### Total Number of Requests for LeoGateway

- 1 min Statistics
  - num_of_writes
  - num_of_reads
  - num_of_deletes
- 5 min Statistics
  - num_of_writes_5min
  - num_of_reads_5min
  - num_of_deletes_5min

#### Object Cache

- count_of_cache-hit
- count_of_cache-miss
- total_of_files
- total_cached_size

### Tags

All measurements have the following tags:

- node

## Example Output

### LeoManager

```text
leofs,host=manager_0,node=manager_0@127.0.0.1 allocated_memory=78255445,allocated_memory_5min=78159025,ets_memory_usage=4611900,ets_memory_usage_5min=4632599,num_of_processes=223,num_of_processes_5min=223,processes_memory_usage=20201316,processes_memory_usage_5min=20186559,system_memory_usage=37172701,system_memory_usage_5min=37189213,total_memory_usage=57373373,total_memory_usage_5min=57374653,used_allocated_memory=67,used_allocated_memory_5min=67 1524105758000000000
```

### LeoStorage

```text
leofs,host=storage_0,node=storage_0@127.0.0.1 allocated_memory=63504384,allocated_memory_5min=0,comp_last_end_datetime=0,comp_last_start_datetime=0,comp_num_of_ongoing_targets=0,comp_num_of_out_of_targets=0,comp_num_of_pending_targets=8,comp_state=0,ets_memory_usage=3877824,ets_memory_usage_5min=0,mq_mdcr_num_of_msg_req_comp_metadata=0,mq_mdcr_num_of_msg_req_sync_obj=0,mq_num_of_msg_async_deletion_dir=0,mq_num_of_msg_deletion_dir=0,mq_num_of_msg_recovery_node=0,mq_num_of_msg_req_deletion_dir=0,num_of_active_objects=70,num_of_deletes=0,num_of_deletes_5min=0,num_of_processes=577,num_of_processes_5min=0,num_of_reads=1,num_of_reads_5min=0,num_of_rebalance_messages=0,num_of_replication_messages=0,num_of_sync-vnode_messages=0,num_of_writes=70,num_of_writes_5min=0,processes_memory_usage=20029464,processes_memory_usage_5min=0,system_memory_usage=25900472,system_memory_usage_5min=0,total_memory_usage=45920987,total_memory_usage_5min=0,total_objects=70,total_size=2,total_size_of_active_objects=2,used_allocated_memory=69,used_allocated_memory_5min=0 1524529826000000000
```

### LeoGateway

```text
leofs,host=gateway_0,node=gateway_0@127.0.0.1 allocated_memory=87941120,allocated_memory_5min=88067672,count_of_cache-hit=0,count_of_cache-miss=0,ets_memory_usage=4843497,ets_memory_usage_5min=4841574,num_of_deletes=0,num_of_deletes_5min=0,num_of_processes=555,num_of_processes_5min=555,num_of_reads=0,num_of_reads_5min=0,num_of_writes=0,num_of_writes_5min=0,processes_memory_usage=17388052,processes_memory_usage_5min=17413928,system_memory_usage=49531263,system_memory_usage_5min=49577819,total_cached_size=0,total_memory_usage=66917393,total_memory_usage_5min=66989469,total_of_files=0,used_allocated_memory=69,used_allocated_memory_5min=69 1524105894000000000
```
