Consensus

Head slot tracking, justification, finalization, and fork choice analysis for PQ Devnet clients.

This notebook examines:

  • Head slot vs current slot (how far behind each client is)
  • Justified and finalized slot progression
  • Head-to-justified, justified-to-finalized, and head-to-finalized distances
  • Fork choice reorgs
Show code
import json
from pathlib import Path

import pandas as pd
import plotly.graph_objects as go
from plotly.subplots import make_subplots
from IPython.display import display

# Set default renderer for static HTML output
import plotly.io as pio
pio.renderers.default = "notebook"
Show code
# Resolve devnet_id
DATA_DIR = Path("../data")

if devnet_id is None:
    devnets_path = DATA_DIR / "devnets.json"
    if devnets_path.exists():
        with open(devnets_path) as f:
            devnets = json.load(f).get("devnets", [])
        if devnets:
            devnet_id = devnets[-1]["id"]
            print(f"Using latest devnet: {devnet_id}")
    else:
        raise ValueError("No devnets.json found. Run 'just detect-devnets' first.")

DEVNET_DIR = DATA_DIR / devnet_id
print(f"Loading data from: {DEVNET_DIR}")
Loading data from: ../data/pqdevnet-20260514T1413Z
Show code
# Load devnet metadata
with open(DATA_DIR / "devnets.json") as f:
    devnets_data = json.load(f)
    devnet_info = next((d for d in devnets_data["devnets"] if d["id"] == devnet_id), None)

if devnet_info:
    print(f"Devnet: {devnet_info['id']}")
    print(f"Duration: {devnet_info['duration_hours']:.1f} hours")
    print(f"Time: {devnet_info['start_time']} to {devnet_info['end_time']}")
    print(f"Slots: {devnet_info['start_slot']} \u2192 {devnet_info['end_slot']}")
    print(f"Clients: {', '.join(devnet_info['clients'])}")
Devnet: pqdevnet-20260514T1413Z
Duration: 0.7 hours
Time: 2026-05-14T14:13:06+00:00 to 2026-05-14T14:57:14+00:00
Slots: 0 → 18377
Clients: ethlambda_0, ethlambda_1, ethlambda_10, ethlambda_11, ethlambda_12, ethlambda_13, ethlambda_14, ethlambda_15, ethlambda_2, ethlambda_3, ethlambda_4, ethlambda_5, ethlambda_6, ethlambda_7, ethlambda_8, ethlambda_9, gean_0, gean_1, gean_10, gean_11, gean_12, gean_13, gean_14, gean_15, gean_2, gean_3, gean_4, gean_5, gean_6, gean_7, gean_8, gean_9, nlean_0, nlean_1, nlean_10, nlean_11, nlean_12, nlean_13, nlean_14, nlean_15, nlean_2, nlean_3, nlean_4, nlean_5, nlean_6, nlean_7, nlean_8, nlean_9, zeam_0, zeam_1, zeam_10, zeam_11, zeam_12, zeam_13, zeam_14, zeam_15, zeam_2, zeam_3, zeam_4, zeam_5, zeam_6, zeam_7, zeam_8, zeam_9

Load Data

Show code
# Unified client list from devnet metadata (includes all containers via cAdvisor)
all_clients = sorted(devnet_info["clients"])
n_cols = min(len(all_clients), 2)
n_rows = -(-len(all_clients) // n_cols)

# Load head slot data
head_df = pd.read_parquet(DEVNET_DIR / "head_slot.parquet")
head_df = head_df.groupby(["client", "metric", "timestamp"], as_index=False)["value"].max()
print(f"Head slot: {len(head_df)} records, clients: {sorted(head_df['client'].unique())}")

# Load finality data
finality_df = pd.read_parquet(DEVNET_DIR / "finality_metrics.parquet")
finality_df = finality_df.groupby(["client", "metric", "timestamp"], as_index=False)["value"].max()
print(f"Finality: {len(finality_df)} records, clients: {sorted(finality_df['client'].unique())}")
print(f"Finality metrics: {sorted(finality_df['metric'].unique())}")

# Load fork choice reorgs
reorgs_df = pd.read_parquet(DEVNET_DIR / "fork_choice_reorgs.parquet")
reorgs_df = reorgs_df.groupby(["client", "timestamp"], as_index=False)["value"].max()
print(f"Reorgs: {len(reorgs_df)} records, clients: {sorted(reorgs_df['client'].unique())}")

print(f"\nAll clients ({len(all_clients)}): {all_clients}")
Head slot: 5534 records, clients: ['ethlambda_0', 'ethlambda_1', 'ethlambda_10', 'ethlambda_11', 'ethlambda_12', 'ethlambda_13', 'ethlambda_14', 'ethlambda_15', 'ethlambda_2', 'ethlambda_3', 'ethlambda_4', 'ethlambda_5', 'ethlambda_6', 'ethlambda_7', 'ethlambda_8', 'ethlambda_9', 'gean_0', 'gean_1', 'gean_10', 'gean_11', 'gean_12', 'gean_13', 'gean_14', 'gean_15', 'gean_2', 'gean_3', 'gean_4', 'gean_5', 'gean_6', 'gean_7', 'gean_8', 'gean_9', 'nlean_0', 'nlean_1', 'nlean_10', 'nlean_11', 'nlean_12', 'nlean_13', 'nlean_14', 'nlean_15', 'nlean_2', 'nlean_3', 'nlean_4', 'nlean_5', 'nlean_6', 'nlean_7', 'nlean_8', 'nlean_9', 'zeam_0', 'zeam_1', 'zeam_10', 'zeam_11', 'zeam_12', 'zeam_13', 'zeam_14', 'zeam_15', 'zeam_2', 'zeam_3', 'zeam_4', 'zeam_5', 'zeam_6', 'zeam_7', 'zeam_8', 'zeam_9']
Finality: 6856 records, clients: ['ethlambda_0', 'ethlambda_1', 'ethlambda_10', 'ethlambda_11', 'ethlambda_12', 'ethlambda_13', 'ethlambda_14', 'ethlambda_15', 'ethlambda_2', 'ethlambda_3', 'ethlambda_4', 'ethlambda_5', 'ethlambda_6', 'ethlambda_7', 'ethlambda_8', 'ethlambda_9', 'gean_0', 'gean_1', 'gean_10', 'gean_11', 'gean_12', 'gean_13', 'gean_14', 'gean_15', 'gean_2', 'gean_3', 'gean_4', 'gean_5', 'gean_6', 'gean_7', 'gean_8', 'gean_9', 'nlean_0', 'nlean_1', 'nlean_10', 'nlean_11', 'nlean_12', 'nlean_13', 'nlean_14', 'nlean_15', 'nlean_2', 'nlean_3', 'nlean_4', 'nlean_5', 'nlean_6', 'nlean_7', 'nlean_8', 'nlean_9', 'zeam_0', 'zeam_1', 'zeam_10', 'zeam_11', 'zeam_12', 'zeam_13', 'zeam_14', 'zeam_15', 'zeam_2', 'zeam_3', 'zeam_4', 'zeam_5', 'zeam_6', 'zeam_7', 'zeam_8', 'zeam_9']
Finality metrics: ['lean_finalized_slot', 'lean_justified_slot', 'lean_latest_finalized_slot', 'lean_latest_justified_slot']
Reorgs: 2769 records, clients: ['ethlambda_0', 'ethlambda_1', 'ethlambda_10', 'ethlambda_11', 'ethlambda_12', 'ethlambda_13', 'ethlambda_14', 'ethlambda_15', 'ethlambda_2', 'ethlambda_3', 'ethlambda_4', 'ethlambda_5', 'ethlambda_6', 'ethlambda_7', 'ethlambda_8', 'ethlambda_9', 'gean_0', 'gean_1', 'gean_10', 'gean_11', 'gean_12', 'gean_13', 'gean_14', 'gean_15', 'gean_2', 'gean_3', 'gean_4', 'gean_5', 'gean_6', 'gean_7', 'gean_8', 'gean_9', 'nlean_0', 'nlean_1', 'nlean_10', 'nlean_11', 'nlean_12', 'nlean_13', 'nlean_14', 'nlean_15', 'nlean_2', 'nlean_3', 'nlean_4', 'nlean_5', 'nlean_6', 'nlean_7', 'nlean_8', 'nlean_9', 'zeam_0', 'zeam_1', 'zeam_10', 'zeam_11', 'zeam_12', 'zeam_13', 'zeam_14', 'zeam_15', 'zeam_2', 'zeam_3', 'zeam_4', 'zeam_5', 'zeam_6', 'zeam_7', 'zeam_8', 'zeam_9']

All clients (64): ['ethlambda_0', 'ethlambda_1', 'ethlambda_10', 'ethlambda_11', 'ethlambda_12', 'ethlambda_13', 'ethlambda_14', 'ethlambda_15', 'ethlambda_2', 'ethlambda_3', 'ethlambda_4', 'ethlambda_5', 'ethlambda_6', 'ethlambda_7', 'ethlambda_8', 'ethlambda_9', 'gean_0', 'gean_1', 'gean_10', 'gean_11', 'gean_12', 'gean_13', 'gean_14', 'gean_15', 'gean_2', 'gean_3', 'gean_4', 'gean_5', 'gean_6', 'gean_7', 'gean_8', 'gean_9', 'nlean_0', 'nlean_1', 'nlean_10', 'nlean_11', 'nlean_12', 'nlean_13', 'nlean_14', 'nlean_15', 'nlean_2', 'nlean_3', 'nlean_4', 'nlean_5', 'nlean_6', 'nlean_7', 'nlean_8', 'nlean_9', 'zeam_0', 'zeam_1', 'zeam_10', 'zeam_11', 'zeam_12', 'zeam_13', 'zeam_14', 'zeam_15', 'zeam_2', 'zeam_3', 'zeam_4', 'zeam_5', 'zeam_6', 'zeam_7', 'zeam_8', 'zeam_9']

Head Slot vs Current Slot

Comparing each client's head slot (lean_head_slot) against the expected current slot (lean_current_slot). A gap indicates the client is falling behind.

Show code
fig = make_subplots(
    rows=n_rows, cols=n_cols,
    subplot_titles=all_clients,
    vertical_spacing=0.12 / max(n_rows - 1, 1) * 2,
    horizontal_spacing=0.08,
)

colors = {"lean_head_slot": "#636EFA", "lean_current_slot": "#EF553B"}
labels = {"lean_head_slot": "head_slot", "lean_current_slot": "current_slot"}
legend_added = set()

for i, client in enumerate(all_clients):
    row = i // n_cols + 1
    col = i % n_cols + 1
    cdf = head_df[head_df["client"] == client]
    has_data = False
    for metric in ["lean_current_slot", "lean_head_slot"]:
        mdf = cdf[cdf["metric"] == metric].sort_values("timestamp")
        if mdf.empty:
            continue
        has_data = True
        label = labels[metric]
        show_legend = metric not in legend_added
        legend_added.add(metric)
        fig.add_trace(
            go.Scatter(
                x=mdf["timestamp"], y=mdf["value"],
                name=label, legendgroup=metric,
                showlegend=show_legend,
                line=dict(color=colors[metric]),
            ),
            row=row, col=col,
        )
    if not has_data:
        fig.add_trace(
            go.Scatter(x=[None], y=[None], showlegend=False, hoverinfo='skip'),
            row=row, col=col,
        )
        _n = (row - 1) * n_cols + col
        _s = "" if _n == 1 else str(_n)
        fig.add_annotation(
            text="No data available",
            xref=f"x{_s} domain", yref=f"y{_s} domain",
            x=0.5, y=0.5,
            showarrow=False,
            font=dict(size=12, color="#999"),
        )
    fig.update_yaxes(title_text="Slot", row=row, col=col)

fig.update_layout(
    title="Head Slot vs Current Slot by Client",
    height=270 * n_rows,
)
fig.show()

Head, Justified & Finalized Slots

Progression of justified and finalized slots over time. With 3SF, both should track closely behind the head slot.

Show code
jf_metrics = ["lean_latest_justified_slot", "lean_latest_finalized_slot"]
jf_df = finality_df[finality_df["metric"].isin(jf_metrics)].copy()

head_only_all = head_df[head_df["metric"] == "lean_head_slot"].copy()
head_only_all["metric"] = "lean_head_slot"

combined = pd.concat([jf_df, head_only_all], ignore_index=True)

fig = make_subplots(
    rows=n_rows, cols=n_cols,
    subplot_titles=all_clients,
    vertical_spacing=0.12 / max(n_rows - 1, 1) * 2,
    horizontal_spacing=0.08,
)

colors = {
    "lean_head_slot": "#636EFA",
    "lean_latest_justified_slot": "#00CC96",
    "lean_latest_finalized_slot": "#EF553B",
}
labels = {
    "lean_head_slot": "head",
    "lean_latest_justified_slot": "justified",
    "lean_latest_finalized_slot": "finalized",
}
legend_added = set()

for i, client in enumerate(all_clients):
    row = i // n_cols + 1
    col = i % n_cols + 1
    cdf = combined[combined["client"] == client]
    has_data = False
    for metric in ["lean_head_slot", "lean_latest_justified_slot", "lean_latest_finalized_slot"]:
        mdf = cdf[cdf["metric"] == metric].sort_values("timestamp")
        if mdf.empty:
            continue
        has_data = True
        show_legend = metric not in legend_added
        legend_added.add(metric)
        fig.add_trace(
            go.Scatter(
                x=mdf["timestamp"], y=mdf["value"],
                name=labels[metric], legendgroup=metric,
                showlegend=show_legend,
                line=dict(color=colors[metric]),
            ),
            row=row, col=col,
        )
    if not has_data:
        fig.add_trace(
            go.Scatter(x=[None], y=[None], showlegend=False, hoverinfo='skip'),
            row=row, col=col,
        )
        _n = (row - 1) * n_cols + col
        _s = "" if _n == 1 else str(_n)
        fig.add_annotation(
            text="No data available",
            xref=f"x{_s} domain", yref=f"y{_s} domain",
            x=0.5, y=0.5,
            showarrow=False,
            font=dict(size=12, color="#999"),
        )
    fig.update_yaxes(title_text="Slot", row=row, col=col)

fig.update_layout(
    title="Head, Justified & Finalized Slot by Client",
    height=270 * n_rows,
)
fig.show()

Head-to-Finalized Distance

Total distance between head slot and finalized slot. This is the combined gap across justification and finalization, showing the overall finality lag.

finalized
justified
head
current
Show code
head_ts_hf = head_df[head_df["metric"] == "lean_head_slot"][["client", "timestamp", "value"]].rename(columns={"value": "head_slot"})
fin_ts_hf = finality_df[finality_df["metric"] == "lean_latest_finalized_slot"][["client", "timestamp", "value"]].rename(columns={"value": "finalized_slot"})
head_fin_lag = head_ts_hf.merge(fin_ts_hf, on=["client", "timestamp"], how="inner")
head_fin_lag["lag"] = head_fin_lag["head_slot"] - head_fin_lag["finalized_slot"]

fig = make_subplots(
    rows=n_rows, cols=n_cols,
    subplot_titles=all_clients,
    vertical_spacing=0.12 / max(n_rows - 1, 1) * 2,
    horizontal_spacing=0.08,
)

for i, client in enumerate(all_clients):
    row = i // n_cols + 1
    col = i % n_cols + 1
    cdf = head_fin_lag[head_fin_lag["client"] == client].sort_values("timestamp")
    if not cdf.empty:
        fig.add_trace(
            go.Scatter(
                x=cdf["timestamp"], y=cdf["lag"],
                name=client, showlegend=False,
                line=dict(color="#636EFA"),
            ),
            row=row, col=col,
        )
    else:
        fig.add_trace(
            go.Scatter(x=[None], y=[None], showlegend=False, hoverinfo='skip'),
            row=row, col=col,
        )
        _n = (row - 1) * n_cols + col
        _s = "" if _n == 1 else str(_n)
        fig.add_annotation(
            text="No data available",
            xref=f"x{_s} domain", yref=f"y{_s} domain",
            x=0.5, y=0.5,
            showarrow=False,
            font=dict(size=12, color="#999"),
        )
    fig.update_yaxes(title_text="Slots", row=row, col=col)

fig.update_layout(
    title="Head-to-Finalized Distance (head_slot - finalized_slot)",
    height=270 * n_rows,
)
fig.show()

Current-to-Head Distance

Difference between current slot and head slot. A value of 0 means the client is fully synced; higher values indicate falling behind.

finalized
justified
head
current
Show code
current_df = head_df[head_df["metric"] == "lean_current_slot"][["client", "timestamp", "value"]].rename(columns={"value": "current_slot"})
head_only = head_df[head_df["metric"] == "lean_head_slot"][["client", "timestamp", "value"]].rename(columns={"value": "head_slot"})
lag_df = current_df.merge(head_only, on=["client", "timestamp"], how="inner")
lag_df["lag"] = lag_df["current_slot"] - lag_df["head_slot"]

fig = make_subplots(
    rows=n_rows, cols=n_cols,
    subplot_titles=all_clients,
    vertical_spacing=0.12 / max(n_rows - 1, 1) * 2,
    horizontal_spacing=0.08,
)

for i, client in enumerate(all_clients):
    row = i // n_cols + 1
    col = i % n_cols + 1
    cdf = lag_df[lag_df["client"] == client].sort_values("timestamp")
    if not cdf.empty:
        fig.add_trace(
            go.Scatter(
                x=cdf["timestamp"], y=cdf["lag"],
                name=client, showlegend=False,
                line=dict(color="#636EFA"),
            ),
            row=row, col=col,
        )
    else:
        fig.add_trace(
            go.Scatter(x=[None], y=[None], showlegend=False, hoverinfo='skip'),
            row=row, col=col,
        )
        _n = (row - 1) * n_cols + col
        _s = "" if _n == 1 else str(_n)
        fig.add_annotation(
            text="No data available",
            xref=f"x{_s} domain", yref=f"y{_s} domain",
            x=0.5, y=0.5,
            showarrow=False,
            font=dict(size=12, color="#999"),
        )
    fig.update_yaxes(title_text="Slots behind", row=row, col=col)

fig.update_layout(
    title="Current-to-Head Distance (current_slot - head_slot)",
    height=270 * n_rows,
)
fig.show()

Head-to-Justified Distance

Gap between head slot and justified slot. A growing gap means the client's head is advancing but justification is not keeping up.

finalized
justified
head
current
Show code
head_ts = head_df[head_df["metric"] == "lean_head_slot"][["client", "timestamp", "value"]].rename(columns={"value": "head_slot"})
just_ts = finality_df[finality_df["metric"] == "lean_latest_justified_slot"][["client", "timestamp", "value"]].rename(columns={"value": "justified_slot"})
justification_lag = head_ts.merge(just_ts, on=["client", "timestamp"], how="inner")
justification_lag["lag"] = justification_lag["head_slot"] - justification_lag["justified_slot"]

fig = make_subplots(
    rows=n_rows, cols=n_cols,
    subplot_titles=all_clients,
    vertical_spacing=0.12 / max(n_rows - 1, 1) * 2,
    horizontal_spacing=0.08,
)

for i, client in enumerate(all_clients):
    row = i // n_cols + 1
    col = i % n_cols + 1
    cdf = justification_lag[justification_lag["client"] == client].sort_values("timestamp")
    if not cdf.empty:
        fig.add_trace(
            go.Scatter(
                x=cdf["timestamp"], y=cdf["lag"],
                name=client, showlegend=False,
                line=dict(color="#636EFA"),
            ),
            row=row, col=col,
        )
    else:
        fig.add_trace(
            go.Scatter(x=[None], y=[None], showlegend=False, hoverinfo='skip'),
            row=row, col=col,
        )
        _n = (row - 1) * n_cols + col
        _s = "" if _n == 1 else str(_n)
        fig.add_annotation(
            text="No data available",
            xref=f"x{_s} domain", yref=f"y{_s} domain",
            x=0.5, y=0.5,
            showarrow=False,
            font=dict(size=12, color="#999"),
        )
    fig.update_yaxes(title_text="Slots", row=row, col=col)

fig.update_layout(
    title="Head-to-Justified Distance (head_slot - justified_slot)",
    height=270 * n_rows,
)
fig.show()

Justified-to-Finalized Distance

Gap between justified slot and finalized slot. A growing gap means justification is advancing but finalization is stalling.

finalized
justified
head
current
Show code
fin_ts = finality_df[finality_df["metric"] == "lean_latest_finalized_slot"][["client", "timestamp", "value"]].rename(columns={"value": "finalized_slot"})
finality_lag = just_ts.merge(fin_ts, on=["client", "timestamp"], how="inner")
finality_lag["lag"] = finality_lag["justified_slot"] - finality_lag["finalized_slot"]

fig = make_subplots(
    rows=n_rows, cols=n_cols,
    subplot_titles=all_clients,
    vertical_spacing=0.12 / max(n_rows - 1, 1) * 2,
    horizontal_spacing=0.08,
)

for i, client in enumerate(all_clients):
    row = i // n_cols + 1
    col = i % n_cols + 1
    cdf = finality_lag[finality_lag["client"] == client].sort_values("timestamp")
    if not cdf.empty:
        fig.add_trace(
            go.Scatter(
                x=cdf["timestamp"], y=cdf["lag"],
                name=client, showlegend=False,
                line=dict(color="#636EFA"),
            ),
            row=row, col=col,
        )
    else:
        fig.add_trace(
            go.Scatter(x=[None], y=[None], showlegend=False, hoverinfo='skip'),
            row=row, col=col,
        )
        _n = (row - 1) * n_cols + col
        _s = "" if _n == 1 else str(_n)
        fig.add_annotation(
            text="No data available",
            xref=f"x{_s} domain", yref=f"y{_s} domain",
            x=0.5, y=0.5,
            showarrow=False,
            font=dict(size=12, color="#999"),
        )
    fig.update_yaxes(title_text="Slots", row=row, col=col)

fig.update_layout(
    title="Justified-to-Finalized Distance (justified_slot - finalized_slot)",
    height=270 * n_rows,
)
fig.show()

Fork Choice Reorgs

Cumulative chain reorgs per client. Reorgs occur when the fork choice rule switches to a different chain head, often caused by late-arriving blocks or attestations.

Show code
fig = make_subplots(
    rows=n_rows, cols=n_cols,
    subplot_titles=all_clients,
    vertical_spacing=0.12 / max(n_rows - 1, 1) * 2,
    horizontal_spacing=0.08,
)

for i, client in enumerate(all_clients):
    row = i // n_cols + 1
    col = i % n_cols + 1
    cdf = reorgs_df[reorgs_df["client"] == client].sort_values("timestamp")
    if not cdf.empty:
        fig.add_trace(
            go.Scatter(
                x=cdf["timestamp"], y=cdf["value"],
                name=client, showlegend=False,
                line=dict(color="#636EFA"),
            ),
            row=row, col=col,
        )
    else:
        fig.add_trace(
            go.Scatter(x=[None], y=[None], showlegend=False, hoverinfo='skip'),
            row=row, col=col,
        )
        _n = (row - 1) * n_cols + col
        _s = "" if _n == 1 else str(_n)
        fig.add_annotation(
            text="No data available",
            xref=f"x{_s} domain", yref=f"y{_s} domain",
            x=0.5, y=0.5,
            showarrow=False,
            font=dict(size=12, color="#999"),
        )
    fig.update_yaxes(title_text="Cumulative reorgs", row=row, col=col)

fig.update_layout(
    title="Fork Choice Reorgs by Client",
    height=270 * n_rows,
)
fig.show()

Summary

Show code
summary_rows = []

for client in all_clients:
    row = {"Client": client}

    # Current-to-head distance
    client_lag = lag_df[lag_df["client"] == client]["lag"]
    if not client_lag.empty:
        row["Avg C-H Dist."] = f"{client_lag.mean():.1f}"
        row["Max C-H Dist."] = f"{client_lag.max():.0f}"

    # Head-to-justified distance
    client_just = justification_lag[justification_lag["client"] == client]["lag"]
    if not client_just.empty:
        row["Avg H-J Dist."] = f"{client_just.mean():.1f}"
        row["Max H-J Dist."] = f"{client_just.max():.0f}"

    # Justified-to-finalized distance
    client_fin = finality_lag[finality_lag["client"] == client]["lag"]
    if not client_fin.empty:
        row["Avg J-F Dist."] = f"{client_fin.mean():.1f}"
        row["Max J-F Dist."] = f"{client_fin.max():.0f}"

    # Head-to-finalized distance
    client_hf = head_fin_lag[head_fin_lag["client"] == client]["lag"]
    if not client_hf.empty:
        row["Avg H-F Dist."] = f"{client_hf.mean():.1f}"
        row["Max H-F Dist."] = f"{client_hf.max():.0f}"

    # Reorgs
    client_reorgs = reorgs_df[reorgs_df["client"] == client]["value"]
    if not client_reorgs.empty:
        row["Reorgs"] = f"{client_reorgs.max():.0f}"

    # Final head slot
    client_head = head_df[(head_df["client"] == client) & (head_df["metric"] == "lean_head_slot")]
    if not client_head.empty:
        row["Final Head Slot"] = f"{client_head['value'].max():.0f}"

    # Final finalized slot
    client_finalized = finality_df[(finality_df["client"] == client) & (finality_df["metric"] == "lean_latest_finalized_slot")]
    if not client_finalized.empty:
        row["Final Finalized Slot"] = f"{client_finalized['value'].max():.0f}"

    summary_rows.append(row)

if summary_rows:
    summary_df = pd.DataFrame(summary_rows).set_index("Client").fillna("-")
    display(summary_df)

print(f"\nDevnet: {devnet_id}")
if devnet_info:
    print(f"Duration: {devnet_info['duration_hours']:.1f} hours")
Avg C-H Dist. Max C-H Dist. Avg H-J Dist. Max H-J Dist. Avg J-F Dist. Max J-F Dist. Avg H-F Dist. Max H-F Dist. Reorgs Final Head Slot Final Finalized Slot
Client
ethlambda_0 2.0 5 17876.0 18205 100.0 100 17976.0 18305 9 18401 96
ethlambda_1 1.7 5 17876.3 18205 100.0 100 17976.3 18305 32 18401 96
ethlambda_10 1.7 5 17876.3 18205 100.0 100 17976.3 18305 23 18401 96
ethlambda_11 1.8 5 17874.2 18205 100.0 100 17974.2 18305 21 18401 96
ethlambda_12 1.8 5 17874.2 18205 100.0 100 17974.2 18305 32 18401 96
... ... ... ... ... ... ... ... ... ... ... ...
zeam_5 31.6 63 17890.4 18236 56.0 56 17946.4 18292 1 18388 96
zeam_6 31.3 63 17888.7 18240 56.0 56 17944.7 18296 1 18392 96
zeam_7 31.6 63 17888.4 18244 56.0 56 17944.4 18300 1 18396 96
zeam_8 33.2 64 17886.8 18248 56.0 56 17942.8 18304 1 18400 96
zeam_9 32.2 63 17890.8 18252 56.0 56 17946.8 18308 1 18404 96

64 rows × 11 columns

Devnet: pqdevnet-20260514T1413Z
Duration: 0.7 hours