\documentclass{article}

\usepackage[T1]{fontenc}
\usepackage{lmodern}

\usepackage{url}
\DeclareUrlCommand\function{\urlstyle{sf}}

\usepackage{xcolor}
\usepackage{tikz}
\usepackage{booktabs}
\usepackage{array}
\usepackage{multirow}
\usepackage{siunitx}

\definecolor{chart Idle}{gray}{.6}
\definecolor{chart Poor}{RGB}{242,28,28}
\definecolor{chart Ok}{RGB}{248,172,37}
\definecolor{chart Ideal}{RGB}{1,151,0}
\definecolor{chart Over}{RGB}{0,125,234}

\newdimen\tempdim
\newcommand*{\Triangle}{%
  \settoheight{\tempdim}{L}%
  \tikz[x=\tempdim, y=\tempdim]\draw(0,0) -- (.5,.5) -- (0,1) --cycle;%
}
\newcommand*{\ChartLegend}[1]{%
  \ifdim\lastkern=1sp %
    \hspace{1em}%
  \fi
  \ChartBox{0.75em}{#1}%
  \,#1%
  \kern-1sp\kern1sp\ignorespaces
}
\newcommand*{\ChartBox}[2]{%
  \begingroup
    \settoheight{\tempdim}{L}%
    \edef\tempheight{\the\tempdim}%
    \settodepth{\tempdim}{g}%
    \edef\tempdepth{\the\tempdim}%
    \tikz[
      baseline=0pt,
      inner sep=0pt,
    ]
    \node[
      fill={chart #2},
      draw,
      rounded corners=1pt,
      anchor=base,
    ]{%
      \vphantom{g\"A}%
      \pgfmathsetlength{\tempdim}{#1}%
      \kern\tempdim\relax
    };%
  \endgroup
}

\begin{document}
\sffamily
\renewcommand*{\arraystretch}{1.2}
\newcommand*{\chart}[2]{%
  #1 & \ChartBox{55mm/3.420*#1}{#2}%
}
\noindent
\begin{tabular}{>{\Triangle\,}lS[mode=text,detect-family,table-format=1.3]@{\,s~}l}
\toprule
\multicolumn{1}{c}{%
  \multirow{2}{*}{Source Function\,/\,Function\,/\,Call Stack}%
}&
  \multicolumn{2}{c}{CPU Time by Utilization}\\
\multicolumn{1}{c}{}& \multicolumn{2}{l}{%
  \ChartLegend{Idle}
  \ChartLegend{Poor}
  \ChartLegend{Ok}
  \ChartLegend{Ideal}
  \ChartLegend{Over}
}\\
\midrule
\relax[Loop at line 151 in \function{divergence_part_1}] &
  \chart{3.420}{Poor} \\
\relax[Loop at line 1071 in \function{radiation_fvm}] &
  \chart{3.270}{Poor} \\
\function{scalar_face_value} &
  \chart{3.090}{Poor} \\
\relax[Loop at line 102 in \function{get_match}] &
  \chart{1.700}{Poor} \\
\function{get_sensible_enthalpy_diff} &
  \chart{1.250}{Poor} \\
\function{compare_vec3} &
  \chart{1.140}{Poor} \\
\bottomrule
\end{tabular}
\end{document}