# Monitor bodies

body match_value scan_log(line)
# @brief Selects lines matching `line` in a growing file
# @param line Regular expression for matching lines.
#
# **See also:** `select_line_matching`, `track_growing_file`
{
      select_line_matching => "$(line)";
      track_growing_file => "true";
}

##

body match_value scan_changing_file(line)
# @brief Selects lines matching `line` in a changing file
# @param line Regular expression for matching lines.
#
# **See also:** `select_line_matching`, `track_growing_file`
{
      select_line_matching => "$(line)";
      track_growing_file => "false";
}

##

body match_value single_value(regex)
# @brief Extract lines matching `regex` as values
# @param regex Regular expression matching lines and values
#
# **See also:** `select_line_matching`, `extraction_regex`
{
      select_line_matching => "$(regex)";
      extraction_regex => "($(regex))";
}

##

body match_value line_match_value(line_match, extract_regex)
# @brief Find lines matching line_match and extract a value matching extract_regex
# @param line_match Regular expression matching line where value is found
# @param extract_regex Regular expression matching value to extract
#
# **See also:** `select_line_matching`, `extraction_regex`
#
# **Example:**
#
# ```cf3
# bundle monitor example
# {
#   vars:
#      "regex_vsz" string => "root\s+[0-9]+\s+[0-9]+\s+[0-9]+\s+[0-9.]+\s+[0-9.]+\s+([0-9]+).*";
#    measurements:
#      "/var/cfengine/state/cf_procs"
#              handle => "cf_serverd_vsz",
#              comment => "Tracking the memory consumption of a process can help us identify possible memory leaks",
#              stream_type => "file",
#              data_type => "int",
#              history_type => "weekly",
#              units => "kB",
#              match_value => line_match_value(".*cf-serverd.*", "$(regex_vsz)");
# }
# ```
{
      select_line_matching => "$(line_match)";
      extraction_regex => "$(extract_regex)";
}