Related to #211 and #212

Here are existing (monotonic) counter metric names:

• faas.coldstarts
• faas.errors
• faas.invocations
• faas.timeouts
• db.client.connection.timeouts
• messaging.kafka.messages
• messaging.kafka.requests.failed
• messaging.kafka.isr.operations
• messaging.kafka.leader.elections
• messaging.kafka.leader.unclean-elections
• hw.energy
• hw.errors
• hw.host.energy
• hw.network.packets
• hw.tape_drive.operations
• hw.*.errors
• process.context_switches
• process.paging.faults
• jvm.classes.loaded
• jvm.classes.unloaded
• system.paging.faults
• system.paging.operations
• system.disk.operations
• system.network.dropped
• system.network.packets
• system.network.errors

.io

• messaging.kafka.network.io
• hw.gpu.io
• hw.network.io
• process.disk.io
• process.network.io
• system.disk.io
• system.network.io

.time

• process.cpu.time
• jvm.cpu.time
• system.cpu.time

.*_time

• system.disk.io_time
• system.disk.operation_time