REST API Endpoint Latency Raincloud

import numpy as np
import matplotlib.pyplot as plt
import scipy.stats as stats

np.random.seed(1010)

# Response time in milliseconds
get_simple = np.random.lognormal(2.5, 0.4, 150)
get_complex = np.random.lognormal(3.5, 0.5, 140)
post_create = np.random.lognormal(3.2, 0.45, 130)
post_update = np.random.lognormal(3.0, 0.4, 135)

get_simple = np.clip(get_simple, 5, 50)
get_complex = np.clip(get_complex, 15, 150)
post_create = np.clip(post_create, 10, 100)
post_update = np.clip(post_update, 8, 80)

F_stat, p_value = stats.f_oneway(get_simple, get_complex, post_create, post_update)

BG_COLOR = "#0a0a0f"
COLOR_SCALE = ["#6CF527", "#F5276C", "#27D3F5", "#F5B027"]

fig, ax = plt.subplots(figsize=(10, 6), facecolor=BG_COLOR)
ax.set_facecolor(BG_COLOR)

y_data = [get_simple, get_complex, post_create, post_update]
positions = [0, 1, 2, 3]
labels = ["GET /simple", "GET /complex", "POST /create", "PUT /update"]

for h in [25, 50, 100]:
    ax.axhline(h, color='#333333', ls=(0, (5, 5)), alpha=0.5, zorder=0)

# SLA thresholds
ax.axhline(y=50, color='#22c55e', ls='--', alpha=0.7, lw=2)
ax.axhline(y=100, color='#ef4444', ls='--', alpha=0.7, lw=2)
ax.text(3.55, 50, "P95 SLA", color='#22c55e', fontsize=9, va='center')
ax.text(3.55, 100, "P99 SLA", color='#ef4444', fontsize=9, va='center')

violins = ax.violinplot(y_data, positions=positions, widths=0.5, 
                         bw_method="silverman", showmeans=False, 
                         showmedians=False, showextrema=False)
for pc in violins["bodies"]:
    pc.set_facecolor("none")
    pc.set_edgecolor("white")
    pc.set_linewidth(1.8)

bp = ax.boxplot(y_data, positions=positions, showfliers=False, showcaps=False,
                medianprops=dict(linewidth=3, color='#F5D327'),
                whiskerprops=dict(linewidth=2, color='#555555'),
                boxprops=dict(linewidth=2, color='#555555'))

for i, (y, color) in enumerate(zip(y_data, COLOR_SCALE)):
    x_jitter = np.array([i] * len(y)) + stats.t(df=6, scale=0.04).rvs(len(y))
    ax.scatter(x_jitter, y, s=50, color=color, alpha=0.5, zorder=2)

means = [y.mean() for y in y_data]
for i, (mean, color) in enumerate(zip(means, COLOR_SCALE)):
    ax.scatter(i, mean, s=180, color='#C82909', zorder=5, edgecolors='white', linewidths=2)
    ax.plot([i, i + 0.28], [mean, mean], ls="dashdot", color="white", zorder=3, lw=1.5)
    ax.text(i + 0.3, mean, f"μ={mean:.0f}ms", fontsize=10, va="center", color='white',
            bbox=dict(facecolor=BG_COLOR, edgecolor=color, boxstyle="round,pad=0.15", lw=2))

# P99 percentiles
p99s = [np.percentile(y, 99) for y in y_data]
for i, (p99, color) in enumerate(zip(p99s, COLOR_SCALE)):
    ax.text(i, -12, f"P99: {p99:.0f}ms", ha='center', fontsize=9, color=color)

ax.spines["right"].set_visible(False)
ax.spines["top"].set_visible(False)
ax.spines["left"].set_color('#444444')
ax.spines["bottom"].set_color('#444444')
ax.tick_params(colors='#888888', length=0)

xlabels = [f"{l}\n(n={len(y_data[i])})" for i, l in enumerate(labels)]
ax.set_xticks(positions)
ax.set_xticklabels(xlabels, size=10, color='white')
ax.set_ylabel("Response Time (ms)", size=14, color='white', fontweight='bold')

ax.set_title("REST API Endpoint Latency Analysis", fontsize=14, color="white", fontweight="bold", pad=20)


ax.set_ylim(-20, 160)
plt.tight_layout()
plt.show()