Ubuntu Manpage: pmlogrewrite - rewrite Performance Co-Pilot archives

NAME

       pmlogrewrite - rewrite Performance Co-Pilot archives

SYNOPSIS

       pmlogrewrite [-Cdiqsvw?]  [-c config] [-V version] inlog [outlog]

DESCRIPTION

pmlogrewrite reads a set of Performance Co-Pilot (PCP) archives identified by inlog and
creates a PCP archive in outlog. Under normal usage, the -c option will be used to
nominate a configuration file or files that contains specifications (see the REWRITING
RULES SYNTAX section below) that describe how the data and metadata from inlog should be
transformed to produce outlog.

The typical uses for pmlogrewrite would be to accommodate the evolution of Performance
Metric Domain Agents (PMDAs) where the names, metadata and semantics of metrics and their
associated instance domains may change over time, e.g. promoting the type of a metric from
a 32-bit to a 64-bit integer, or renaming a group of metrics. Refer to the EXAMPLES
section for some additional use cases.

pmlogrewrite may also be used to redact sensitive information from PCP archives in
situations where the archives need to be shipped to another organization or to meet
privacy policies or legislative requirements. See pmlogredact(1) for an example use of
pmlogrewrite in this context.

pmlogrewrite is most useful where PMDA changes, or errors in the production environment,
result in archives that cannot be combined with pmlogextract(1). By pre-processing the
archives with pmlogrewrite the resulting archives may be able to be merged with
pmlogextract(1).

The input inlog must be a set of PCP archives created by pmlogger(1), or possibly one of
the tools that read and create PCP archives, e.g. pmlogextract(1) and pmlogreduce(1).
inlog is a comma-separated list of names, each of which may be the base name of an archive
or the name of a directory containing one or more archives.

If no -c option is specified, then the default behavior simply creates outlog as a copy of
inlog. This is a little more complicated than cat(1), as each PCP archive is made up of
several physical files.

While pmlogrewrite may be used to repair some data consistency issues in PCP archives,
there is also a class of repair tasks that cannot be handled by pmlogrewrite and
pmloglabel(1) may be a useful tool in these cases.

OPTIONS

The available command line options are:

-c config, --config=config
If config is a file or symbolic link, read and parse rewriting rules from there. If
config is a directory, then all of the files or symbolic links in that directory
(excluding those beginning with a period ``.'') will be used to provide the rewriting
rules. Multiple -c options are allowed.

-C, --check
Parse the rewriting rules and quit. outlog is not created, so this command line
argument is optional with -C. When -C is specified, this also sets -v and -w so that
all warnings and verbose messages are displayed as config is parsed.

-d, --desperate
Desperate mode. Normally if a fatal error occurs, all trace of the partially written
PCP archive outlog is removed. With the -d option, the partially created outlog
archive is not removed.

-i Rather than creating outlog, inlog is rewritten in place when the -i option is used.
A new archive is created using temporary file names and then renamed to inlog in such
a way that if any errors (not warnings) are encountered, inlog remains unaltered.

-q, --quick
Quick mode, where if there are no rewriting actions to be performed (none of the
global data, instance domains or metrics from inlog will be changed), then
pmlogrewrite will exit (with status 0, so success) immediately after parsing the
configuration file(s) and outlog is not created.

-s, --scale
When the ``units'' of a metric are changed, if the dimension in terms of space, time
and count is unaltered, then the scaling factor is being changed, e.g. BYTE to KBYTE,
or MSEC-1 to USEC-1, or the composite MBYTE.SEC-1 to KBYTE.USEC-1. The motivation
may be (a) that the original metadata was wrong but the values in inlog are correct,
or (b) the metadata is changing so the values need to change as well. The default
pmlogrewrite behaviour matches case (a). If case (b) applies, then use the -s option
and the values of all the metrics with a scale factor change in each result will be
rescaled. For finer control over value rescaling refer to the RESCALE option for the
UNITS clause of the metric rewriting rule described below.

-v, --verbose
Enable verbose mode.

-V version, --version=version
Specifies the version of the output PCP archive being produced. Currently versions 2
and 3 of the archive format is supported. The version of inlog must be at least
version (so version upgrade is allowed, but version downgrade is not). By default,
in the absence of the -V option, the version of outlog is the same as the version of
inlog.

-w, --warnings
Emit warnings. Normally pmlogrewrite remains silent for any warning that is not
fatal and it is expected that for a particular archive, some (or indeed, all) of the
rewriting specifications may not apply. For example, changes to a PMDA may be
captured in a set of rewriting rules, but a single archive may not contain all of the
modified metrics nor all of the modified instance domains and/or instances. Because
these cases are expected, they do not prevent pmlogrewrite executing, and rules that
do not apply to inlog are silently ignored by default. Similarly, some rewriting
rules may involve no change because the metadata in inlog already matches the intent
of the rewriting rule to correct data from a previous version of a PMDA. The -w flag
forces warnings to be emitted for all of these cases.

-?, --help
Display usage message and exit.

The argument outlog is required in all cases, except when -i is specified.

REWRITING RULES SYNTAX

A configuration file contains zero or more rewriting rules as defined below.

Keywords and special punctuation characters are shown below in bolditalic font and are
case-insensitive, so METRIC, metric and Metric are all equivalent in rewriting rules.

The character ``#'' introduces a comment and the remainder of the line is ignored.
Otherwise the input is relatively free format with optional white space (spaces, tabs or
newlines) between lexical items in the rules.

A global rewriting rule has the form:

GLOBAL { globalspec ... }

where globalspec is zero or more of the following clauses:

HOSTNAME -> hostname

Modifies the label records in the outlog PCP archive, so that the metrics will
appear to have been collected from the host hostname.

TIME -> delta

Both metric values and the instance domain metadata in a PCP archive carry
timestamps. This clause forces all the timestamps to be adjusted by delta, where
delta is an optional sign ``+'' (the default) or ``-'', an optional number of
hours followed by a colon ``:'', an optional number of minutes followed by a colon
``:'', a number of seconds, an optional fraction of seconds following a period
``.''. The simplest example would be ``30'' to increase the timestamps by 30
seconds. A more complex example would be ``-23:59:59.999'' to move the timestamps
backwards by one millisecond less than one day.

TIMEZONE -> "timezone"
TZ -> "timezone"

Modifies the label records in the outlog PCP archive, so that the metrics will
appear to have been collected from a host with a local timezone of timezone.
timezone must be enclosed in double quotes, and should conform to the valid
timezone syntax rules for the local platform, usually a Posix TZ format, e.g.
AEST-10. See tzset(3) for more information.

TZ is an alias for TIMEZONE.

ZONEINFO -> "zoneinfo"

Modifies the label records in the outlog PCP archive, so that the metrics will
appear to have been collected from a host with a local timezone of zoneinfo.
zoneinfo must be enclosed in double quotes, and should conform to the valid
zoneinfo timezone syntax rules for the local platform, usually a colon followed by
a pathname below /usr/share/zoneinfo, e.g. :Africa/Timbuktu. See tzset(3) for
more information.

The zoneinfo clause is only allowed if the output archive version is at least 3.

FEATURES -> feature-bits

Modifies the label records in the outlog PCP archive, so that the metrics will
appear to have been collected from system with a pmlogger(1) that supports the
``features'' defined by the integer value feature-bits, which is formed by
``or''ing the desired feature flags as defined in LOGARCHIVE(5). Alternatively,
feature-bits can be specified using the ``macro'' BITS() that takes a comma
separated argument list of integers (in the inclusive range 0 to 31) and sets the
corresponding bits. For example
features -> bits(31,7,1)

The features clause is only allowed if the output archive version is at least 3.

An indom rewriting rule modifies an instance domain and has the form:

INDOM domain.serial { indomspec ... }

where domain and serial identify one or more existing instance domains from inlog -
typically domain would be an integer in the range 1 to 510 and serial would be an integer
in the range 0 to 4194304.

As a special case serial could be an asterisk ``*'' which means the rule applies to every
instance domain with a domain number of domain.

If a designated instance domain is not in inlog the rule has no effect.

The indomspec is zero or more of the following clauses:

INAME "oldname" -> "newname"

The instance identified by the external instance name oldname is renamed to
newname. Both oldname and newname must be enclosed in double quotes.

As a special case, the new name may be the keyword DELETE (with no double quotes),
and then the instance oldname will be expunged from outlog which removes it from
the instance domain metadata and removes all values of this instance for all the
associated metrics.

If the instance names contain any embedded spaces then special care needs to be
taken in respect of the PCP instance naming rule that treats the leading non-space
part of the instance name as the unique portion of the name for the purposes of
matching and ensuring uniqueness within an instance domain, refer to
pmdaInstance(3) for a discussion of this issue.

As an illustration, consider the hypothetical instance domain for a metric which
contains 2 instances with the following names:
red
eek urk

Then some possible INAME clauses might be:

"eek" -> "yellow like a flower"
Acceptable, oldname "eek" matches the "eek urk" instance.

"red" -> "eek"
Error, newname "eek" matches the existing "eek urk" instance.

"eek urk" -> "red of another hue"
Error, newname "red of another hue" matches the existing "red" instance.

INAME REPLACE /pattern/ -> "replacement"

Every external instance name in the instance domain is matched against the regular
expression pattern and when a match is found, the name is changed based on the
parts of the name matched by pattern and the replacement recipe. pattern follows
the syntax of a Posix Extended Regular Expression (see regex(7)) and replacement
follows the syntax of the s command of sed(1), so & and \1 through \9 may be used
to select all or substrings of the instance name that matches pattern.

Note that the match-and-replace is done at most once per external instance name,
so if there are repeated sequences of the name that match pattern only the first
one will be matched and replacement applied.

pattern is normally enclosed in slashes (/) or double quotes ("). An escape (\)
may be used before any of the metacharacters described in regex(3) to specify a
literal character, e.g. \( or \[ or \+ ... The enclosing delimiters cannot be
escaped, so to embed a literal slash, use double quotes as the delimiter, or vice
versa.

replacement is normally enclosed by double quotes (") or slashes (/). An escape
(\) may be used before & or \ to specify these characters literally. The
enclosing delimiters cannot be escaped, so to embed a double quote, use slashes as
the delimiter, or vice versa.

If the instance names after replacement contain any embedded spaces then special
care needs to be taken in respect of the PCP instance naming rule that treats the
leading non-space part of the instance name as the unique portion of the name for
the purposes of matching and ensuring uniqueness within an instance domain. Refer
to pmdaInstance(3) for a discussion of this issue.

Here are some examples:

{ iname replace /[a-z]*foo[a-z]*/ -> "FOO" }
replace any word containing "foo" with "FOO"

{ iname replace "([0-9]+) /.*/(.*)" -> "\1 \2" }
removes a directory path, so the instance name (for one of the proc
PMDA's metrics) "2981799 /home/kenj/bin/foobar" would become "2981799
foobar", hiding the user's home directory and implicitly the user's
login name

INAME REDACT

Replace every external instance name in the instance domain by the string "inst
[redacted]" where inst is the internal instance identifier in ASCII format.

INDOM -> newdomain.newserial

Modifies the metadata for the instance domain and every metric associated with the
instance domain. As a special case, newserial could be an asterisk ``*'' which
means use serial from the indom rewriting rule, although this is most useful when
serial is also an asterisk. So for example:
indom 29.* { indom -> 109.* }
will move all instance domains from domain 29 to domain 109.

INDOM -> DUPLICATE newdomain.newserial

A special case of the previous INDOM clause where the instance domain is a
duplicate copy of the domain.serial instance domain from the indom rewriting rule,
and then any mapping rules are applied to the copied newdomain.newserial instance
domain. This is useful when a PMDA is split and the same instance domain needs to
be replicated for domain domain and domain newdomain. So for example if the
metrics foo.one and foo.two are both defined over instance domain 12.34, and
foo.two is moved to another PMDA using domain 27, then the following rewriting
rules could be used:
indom 12.34 { indom -> duplicate 27.34 }
metric foo.two { indom -> 27.34 pmid -> 27.*.* }

INST oldid -> newid

The instance identified by the internal instance identifier oldid is renumbered to
newid. Both oldid and newid are integers in the range 0 to 231-1.

As a special case, newid may be the keyword DELETE and then the instance oldid
will be expunged from outlog which removes it from the instance domain metadata
and removes all values of this instance for all the associated metrics.

A metric rewriting rule has the form:

METRIC metricid { metricspec ... }

where metricid identifies one or more existing metrics from inlog using either a metric
name, or the internal encoding for a metric's PMID as domain.cluster.item. In the latter
case, typically domain would be an integer in the range 1 to 510, cluster would be an
integer in the range 0 to 4095, and item would be an integer in the range 0 to 1023.

As special cases item could be an asterisk ``*'' which means the rule applies to every
metric with a domain number of domain and a cluster number of cluster, or cluster could be
an asterisk which means the rule applies to every metric with a domain number of domain
and an item number of item, or both cluster and item could be asterisks, and rule applies
to every metric with a domain number of domain.

If a designated metric is not in inlog the rule has no effect.

The metricspec is zero or more of the following clauses:

DELETE

The metric is completely removed from outlog, both the metadata and all values in
results are expunged.

INDOM -> newdomain.newserial [ pick ]

Modifies the metadata to change the instance domain for this metric. The new
instance domain must exist in outlog.

The optional pick clause may be used to select one input value, or compute an
aggregate value from the instances in an input result, or assign an internal
instance identifier to a single output value. If no pick clause is specified, the
default behaviour is to copy all input values from each input result to an output
result, however if the input instance domain is singular (indom PM_INDOM_NULL)
then the one output value must be assigned an internal instance identifier, which
is 0 by default, unless over-ridden by a INST or INAME clause as defined below.

The choices for pick are as follows:

OUTPUT FIRST
choose the value of the first instance from each input result

OUTPUT LAST choose the value of the last instance from each input result

OUTPUT INST instid
choose the value of the instance with internal instance identifier
instid from each result; the sequence of rewriting rules ensures the
OUTPUT processing happens before instance identifier renumbering from
any associated indom rule, so instid should be one of the internal
instance identifiers that appears in inlog

OUTPUT INAME "name"
choose the value of the instance with name for its external instance
name from each result; the sequence of rewriting rules ensures the
OUTPUT processing happens before instance renaming from any associated
indom rule, so name should be one of the external instance names that
appears in inlog

OUTPUT MIN choose the smallest value in each result (metric type must be numeric
and output instance will be 0 for a non-singular instance domain)

OUTPUT MAX choose the largest value in each result (metric type must be numeric
and output instance will be 0 for a non-singular instance domain)

OUTPUT SUM choose the sum of all values in each result (metric type must be
numeric and output instance will be 0 for a non-singular instance
domain)

OUTPUT AVG choose the average of all values in each result (metric type must be
numeric and output instance will be 0 for a non-singular instance
domain)

If the input instance domain is singular (indom PM_INDOM_NULL) then independent of
any pick specifications, there is at most one value in each input result and so
FIRST, LAST, MIN, MAX, SUM and AVG are all equivalent and the output instance
identifier will be 0.

In general it is an error to specify a rewriting action for the same metadata or
result values more than once, e.g. more than one INDOM clause for the same
instance domain. The one exception is the possible interaction between the INDOM
clauses in the indom and metric rules. For example the metric sample.bin is
defined over the instance domain 29.2 in inlog and the following is acceptable
(albeit redundant):
indom 29.* { indom -> 109.* }
metric sample.bin { indom -> 109.2 }
However the following is an error, because the instance domain for sample.bin has
two conflicting definitions:
indom 29.* { indom -> 109.* }
metric sample.bin { indom -> 123.2 }

INDOM -> NULL[ pick ]

The metric (which must have been previously defined over an instance domain) is
being modified to be a singular metric. This involves a metadata change and
collapsing all results for this metric so that multiple values become one value.

The optional pick part of the clause defines how the one value for each result
should be calculated and follows the same rules as described for the non-NULL
INDOM case above.

In the absence of pick, the default is OUTPUT FIRST.

NAME -> newname

Renames the metric in the PCP archive's metadata that supports the Performance
Metrics Name Space (PMNS). newname should not match any existing name in the
archive's PMNS and must follow the syntactic rules for valid metric names as
outlined in PMNS(5).

PMID -> newdomain.newcluster.newitem

Modifies the metadata and results to renumber the metric's PMID. As special
cases, newcluster could be an asterisk ``*'' which means use cluster from the
metric rewriting rule and/or item could be an asterisk which means use item from
the metric rewriting rule. This is most useful when cluster and/or item is also
an asterisk. So for example:
metric 30.*.* { pmid -> 123.*.* }
will move all metrics from domain 30 to domain 123.

SEM -> newsem

Change the semantics of the metric. newsem should be the XXX part of the name of
one of the PM_SEM_XXX macros defined in <pcp/pmapi.h> or pmLookupDesc(3), e.g.
COUNTER for PM_TYPE_COUNTER.

No data value rewriting is performed as a result of the SEM clause, so the
usefulness is limited to cases where a version of the associated PMDA was
exporting incorrect semantics for the metric. pmlogreduce(1) may provide an
alternative in cases where re-computation of result values is desired.

TYPE -> newtype

Change the type of the metric which alters the metadata and may change the
encoding of values in results. newtype should be the XXX part of the name of one
of the PM_TYPE_XXX macros defined in <pcp/pmapi.h> or pmLookupDesc(3), e.g. FLOAT
for PM_TYPE_FLOAT.

Type conversion is only supported for cases where the old and new metric type is
numeric, so PM_TYPE_STRING, PM_TYPE_AGGREGATE and PM_TYPE_EVENT are not allowed.
Even for the numeric cases, some conversions may produce run-time errors, e.g.
integer overflow, or attempting to rewrite a negative value into an unsigned type.

TYPE IF oldtype -> newtype

The same as the preceding TYPE clause, except the type of the metric is only
changed to newtype if the type of the metric in inlog is oldtype.

This useful in cases where the type of metricid in inlog may be platform dependent
and so more than one type rewriting rule is required.

UNITS -> newunits [ RESCALE ]

newunits is six values separated by commas. The first 3 values describe the
dimension of the metric along the dimensions of space, time and count; these are
integer values, usually 0, 1 or -1. The remaining 3 values describe the scale of
the metric's values in the dimensions of space, time and count. Space scale
values should be 0 (if the space dimension is 0), else the XXX part of the name of
one of the PM_SPACE_XXX macros, e.g. KBYTE for PM_TYPE_KBYTE. Time scale values
should be 0 (if the time dimension is 0), else the XXX part of the name of one of
the PM_TIME_XXX macros, e.g. SEC for PM_TIME_SEC. Count scale values should be 0
(if the time dimension is 0), else ONE for PM_COUNT_ONE.

The PM_SPACE_XXX, PM_TIME_XXX and PM_COUNT_XXX macros are defined in <pcp/pmapi.h>
or pmLookupDesc(3).

When the scale is changed (but the dimension is unaltered) the optional keyword
RESCALE may be used to chose value rescaling as per the -s command line option,
but applied to just this metric.

VALUE REPLACE /pattern/ -> "replacement"

The value for every instance of the metric is matched against the regular
expression pattern and when a match is found, the value is changed based on the
parts of the value matched by pattern and the replacement recipe. pattern follows
the syntax of a Posix Extended Regular Expression (see regex(7)) and replacement
follows the syntax of the s command of sed(1), so & and \1 through \9 may be used
to select all or substrings of the value that matches pattern.

Note that the match-and-replace is done at most once per metric value, so if there
are repeated sequences of the metric value that match pattern only the first one
will be matched and replacement applied.

The REPLACE keyword is optional.

This clause can only be applied to metrics with values of type PM_TYPE_STRING.

Here are some examples:

{ value /.*/ -> "" }
remove the value everywhere

value "/.*/(.*)" -> "\1" }
removes a directory path, so the metric value "mumble
/home/kenj/bin/foobar fumble" would become "mumble foobar fumble",
hiding the user's home directory and implicitly the user's login name

When changing the domain number for a metric or instance domain, the new domain number
will usually match an existing PMDA's domain number. If this is not the case, then
the new domain number should not be randomly chosen; consult $PCP_VAR_DIR/pmns/stdpmid
for domain numbers that are already assigned to PMDAs.

A text rewriting rule modifies a help text record and has the form:

TEXT textid [ texttype ] [ "textcontent" ] { textspec ... }

where textid identifies the metric or instance domain with which the text is currently
associated, and is either METRIC metricid or INDOM domain.serial.

metricid has the same form and meaning as for a METRIC rewriting rule (see above) and
domain.serial has the same form and meaning as for an INDOM rewriting rule (see above).

The optional texttype identifies the type of text and may be one of ONELINE to select the
one line help text, HELP to select the full help text, or ALL or an asterisk ``*'' to
select both types of help text. If texttype is not specified, then the default is
ONELINE.

The optional textcontent further restricts the selected text records to those containing
the specified content. Characters such as double quotes may be escaped by preceding them
with a backslash ``\''.

If a designated help text record is not in inlog the rule has no effect.

The textspec is zero or more of the following clauses:

DELETE

The selected text is completely removed from outlog.

INDOM -> newdomain.newserial

Re-associates the text with the specified instance domain. As a special case,
newserial could be an asterisk ``*'' which means use serial from the text
rewriting rule, although this is most useful when serial is also an asterisk. So
for example:
text indom 29.* all { indom -> 109.* }
will re-associate all text associated with instance domains from domain 29 to
domain 109.

METRIC -> newdomain.newcluster.newitem

Re-associates the text with the specified metric. As special cases, newcluster
could be an asterisk ``*'' which means use cluster from the text rewriting rule
and/or item could be an asterisk which means use item from the text rewriting
rule. This is most useful when cluster and/or item is also an asterisk. So for
example:
text metric 30.*.* all { metric -> 123.*.* }
will re-associate all text associated with metrics from domain 30 to domain 123.

TEXT -> "new-text"

Replaces the content of the selected text with new-text.

A label rewriting rule modifies a label record and has the form:

LABEL labelid [ instance ] [ "label-name" ] [ "label-value" ] { labelspec ... }

where labelid refers to the global context or identifies the metric domain, metric
cluster, metric item, instance domain, or instance domain instances with which the label
is currently associated, and is either CONTEXT or DOMAIN domainid or CLUSTER
domainid.clusterid or ITEM metricid or INDOM domain.serial or INSTANCES domain.serial.

metricid has the same form and meaning as for a METRIC rewriting rule (see above).
clusterid may be an asterisk ``*'' which means the rule applies to every metric with a
domain number of domainid in the same way as an asterisk may be used for the cluster
within metricid.

domain.serial has the same form and meaning as for an INDOM rewriting rule (see above).

In the case of an INSTANCES labelid, the name or number of a specific instance may be
optionally specified as instance. This name or number number may be omitted or specified
as an asterisk ``*'' to indicate that labels for all instances of the specified instance
domain are selected. If an instance name is specified, it must be within double quotes.
If the instance name contains any embedded spaces then special care needs to be taken in
respect of the PCP instance naming rule that treats the leading non-space part of the
instance name as the unique portion of the name for the purposes of matching and ensuring
uniqueness within an instance domain, refer to pmdaInstance(3) for a discussion of this
issue.

In all cases, a "label-name" and/or a "label-value" may be optionally specified in double
quotes in order to select labels with the given name and/or given value. These may
individually be omitted or specified as asterisks ``*'' to indicate that labels with all
names and/or values are selected.

If a designated label record is not in inlog the rule has no effect.

The labelspec is zero or more of the following clauses:

DELETE

The selected labels are completely removed from outlog.

NEW "new-label-name" "new-label-value"

A new label with the name "new-label-name" and the value "new-label-value" is
created and associated with the specified labelid and optional instance (in the
case of a INSTANCES labelid). If "label-name" or "label-value" were specified,
then they are ignored with a warning. If instance is not specified for an
INSTANCES labelid, then a new label will be created for each instance in the
specified instance domain.

LABEL -> "new-label-name"

The name of the selected label(s) is changed to "new-label-name".

VALUE -> "new-label-value"

The value of the selected label(s) is changed to "new-label-value".

DOMAIN -> newdomain

Re-associates the selected label(s) with the specified metric domain. For
example:
label domain 30 { domain -> 123 }
will re-associate all labels associated with domains from domain 30 to domain 123.

CLUSTER -> newdomain.newcluster

Re-associates the selected label(s) with the specified metric cluster. As a
special case, newcluster could be an asterisk ``*'' which means use cluster from
the label rewriting rule. This is most useful when cluster is also an asterisk.
So for example:
label cluster 30.* { cluster -> 123.* }
will re-associate all labels associated with clusters from domain 30 to domain
123.

ITEM -> newdomain.newcluster.newitem

Re-associates the selected label(s) with the specified metric item. As special
cases, newcluster could be an asterisk ``*'' which means use cluster from the
label rewriting rule and/or item could be an asterisk which means use item from
the label rewriting rule. This is most useful when cluster and/or item is also an
asterisk. So for example:
label item 30.*.* { item -> 123.*.* }
will re-associate all labels associated with metrics from domain 30 to domain 123.

INDOM -> newdomain.newserial

Re-associates the selected label(s) with the specified instance domain. As a
special case, newserial could be an asterisk ``*'' which means use serial from the
label rewriting rule, although this is most useful when serial is also an
asterisk. So for example:
label indom 29.* { indom -> 109.* }
will re-associate all labels associated with instance domains from domain 29 to
domain 109.

INSTANCES -> newdomain.newserial

This is the same as INDOM except that it re-associates the selected label(s) with
the instances of the specified instance domain.

EXAMPLES

       To  promote  the values of the per-disk IOPS metrics to 64-bit to allow aggregation over a
       long time period for capacity planning, or because the PMDA has changed to  export  64-bit
       counters  and  we  want  to  convert  old  archives so they can be processed alongside new
       archives.
           metric disk.dev.read { type -> U64 }
           metric disk.dev.write { type -> U64 }
           metric disk.dev.total { type -> U64 }

       The instances associated with the load average metric kernel.all.load could be renamed and
       renumbered by the rules below.
           # for the Linux PMDA, the kernel.all.load metric is defined
           # over instance domain 60.2
           indom 60.2 {
               inst 1 -> 60 iname "1 minute" -> "60 second"
               inst 5 -> 300 iname "5 minute" -> "300 second"
               inst 15 -> 900 iname "15 minute" -> "900 second"
           }

       If  we  decide  to  split  the  ``proc''  metrics out of the Linux PMDA, this will involve
       changing the domain number for the PMID of  these  metrics  and  the  associated  instance
       domains.  The rules below would rewrite an old archive to match the changes after the PMDA
       split.
           # all Linux proc metrics are in 7 clusters
           metric 60.8.* { pmid -> 123.*.* }
           metric 60.9.* { pmid -> 123.*.* }
           metric 60.13.* { pmid -> 123.*.* }
           metric 60.24.* { pmid -> 123.*.* }
           metric 60.31.* { pmid -> 123.*.* }
           metric 60.32.* { pmid -> 123.*.* }
           metric 60.51.* { pmid -> 123.*.* }
           # only one instance domain for Linux proc metrics
           indom 60.9 { indom -> 123.0 }

       If the metric foo.count_em was exported as a native ``long'' then it  could  be  a  32-bit
       integer   on  some  platforms  and  a  64-bit  integer  on  other  platforms.   Subsequent
       investigations show the value is in fact unsigned, so the following rules could be used.
           metric foo.count_em {
                type if 32 -> U32
                type if 64 -> U64
           }

DIAGNOSTICS

       All error conditions detected by pmlogrewrite are reported  on  stderr  with  textual  (if
       sometimes terse) explanation.

       Should  the  input  archive be corrupted (this can happen if the pmlogger instance writing
       the archive suddenly dies), then pmlogrewrite will detect and report the position  of  the
       corruption  in  the  file,  and  any  subsequent information from that archive will not be
       processed.

       If the input archive contains no archive records then  an  ``empty  archive''  warning  is
       issued and no processing is performed.

       If any error is detected, pmlogrewrite will exit with a non-zero status.

FILES

       For each of the inlog and outlog archives, several physical files are used.

       archive.meta
            metadata (metric descriptions, instance domains, etc.) for the archive

       archive.0
            initial volume of metrics values (subsequent volumes have suffixes 1, 2, ...).

       archive.index
            temporal index to support rapid random access to the other files in the archive.

PCP ENVIRONMENT

       Environment variables with the prefix PCP_ are used to parameterize the file and directory
       names used by PCP.  On each installation, the file /etc/pcp.conf contains the local values
       for  these  variables.   The  $PCP_CONF  variable  may  be  used to specify an alternative
       configuration file, as described in pcp.conf(5).

       For environment variables affecting PCP tools, see pmGetOptions(3).

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

REWRITING RULES SYNTAX

EXAMPLES

DIAGNOSTICS

FILES

PCP ENVIRONMENT

SEE ALSO