htop/pcp/meters/mysql

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Add a new DynamicMeter class for runtime Meter extension This commit is based on exploratory work by Sohaib Mohamed. The end goal is two-fold - to support addition of Meters we build via configuration files for both the PCP platform and for scripts ( https://github.com/htop-dev/htop/issues/526 ) Here, we focus on generic code and the PCP support. A new class DynamicMeter is introduced - it uses the special case 'param' field handling that previously was used only by the CPUMeter, such that every runtime-configured Meter is given a unique identifier. Unlike with the CPUMeter this is used internally only. When reading/writing to htoprc instead of CPU(N) - where N is an integer param (CPU number) - we use the string name for each meter. For example, if we have a configuration for a DynamicMeter for some Redis metrics, we might read and write "Dynamic(redis)". This identifier is subsequently matched (back) up to the configuration file so we're able to re-create arbitrary user configurations. The PCP platform configuration file format is fairly simple. We expand configs from several directories, including the users homedir alongside htoprc (below htop/meters/) and also /etc/pcp/htop/meters. The format will be described via a new pcp-htop(5) man page, but its basically ini-style and each Meter has one or more metric expressions associated, as well as specifications for labels, color and so on via a dot separated notation for individual metrics within the Meter. A few initial sample configuration files are provided below ./pcp/meters that give the general idea. The PCP "derived" metric specification - see pmRegisterDerived(3) - is used as the syntax for specifying metrics in PCP DynamicMeters.
2021-06-23 07:44:56 +00:00
#
# pcp-htop(1) configuration file - see pcp-htop(5)
#
[mysql_io]
caption = MySQL I/O
recv.metric = mysql.status.bytes_received
recv.color = green
recv.label = recv
sent.metric = mysql.status.bytes_sent
sent.color = blue
sent.label = sent
[mysql_keys]
caption = MySQL keys
description = MySQL key status
key_blocks_used.metric = mysql.status.key_blocks_used
key_blocks_used.label = color
key_blocks_used.label = used
key_reads.metric = mysql.status.key_reads
key_reads.label = read
key_reads.color = green
key_writes.metric = mysql.status.key_writes
key_writes.label = writ
key_writes.color = blue
key_read_requests.metric = mysql.status.key_read_requests
key_read_requests.label = rreq
key_read_requests.color = green
key_write_requests.metric = mysql.status.key_write_requests
key_write_requests.label = wreq
key_write_requests.color = blue
[innodb_buffer]
caption = InnoDB pool
description = InnoDB buffer pool
created.metric = mysql.status.innodb_pages_created
created.label = cr
created.color = yellow
read.metric = mysql.status.innodb_pages_read
read.label = rd
read.color = greed
written.metric = mysql.status.innodb_pages_written
written.label = wr
written.color = red
[innodb_io]
caption = InnoDB I/O
description = InnoDB I/O operations
read.metric = mysql.status.innodb_data_read
read.label = rd
read.color = green
written.metric = mysql.status.innodb_data.writes
written.label = wr
written.color = blue
sync.metric = mysql.status.innodb_data_fsyncs
sync.label = sync
sync.color = cyan
[innodb_ops]
caption = InnoDB ops
description = InnoDB operations
inserted.metric = mysql.status.innodb_rows_inserted
inserted.label = ins
inserted.color = blue
updated.metric = mysql.status.innodb_rows_updated
updated.label = upd
updated.color = cyan
deleted.metric = mysql.status.innodb_rows_deleted
deleted.label = del
deleted.color = red
read.metric = mysql.status.innodb_rows_read
read.label = rd
read.color = green